diff --git a/src/crashlog.cpp b/src/crashlog.cpp
index 6d878d1caf..8af0103b8f 100644
--- a/src/crashlog.cpp
+++ b/src/crashlog.cpp
@@ -559,7 +559,7 @@ char *CrashLog::FillCrashLog(char *buffer, const char *last)
 	buffer = this->TryCrashLogFaultSection(buffer, last, "times", [](CrashLog *self, char *buffer, const char *last) -> char * {
 		buffer += UTCTime::Format(buffer, last, "Crash at: %Y-%m-%d %H:%M:%S (UTC)\n");
 
-		buffer += seprintf(buffer, last, "In game date: %i-%02i-%02i (%i, %i) (DL: %u)\n", _cur_date_ymd.year, _cur_date_ymd.month + 1, _cur_date_ymd.day, _date_fract, _tick_skip_counter, _settings_game.economy.day_length_factor);
+		buffer += seprintf(buffer, last, "In game date: %i-%02i-%02i (%i, %i) (DL: %u)\n", _cur_date_ymd.year, _cur_date_ymd.month + 1, _cur_date_ymd.day, _date_fract, _tick_skip_counter, DayLengthFactor());
 		LogGameLoadDateTimes(buffer, last);
 		return buffer;
 	});
@@ -677,7 +677,7 @@ char *CrashLog::FillDesyncCrashLog(char *buffer, const char *last, const DesyncE
 	extern uint32_t _frame_counter;
 
 	buffer += seprintf(buffer, last, "In game date: %i-%02i-%02i (%i, %i) (DL: %u), %08X\n",
-			_cur_date_ymd.year, _cur_date_ymd.month + 1, _cur_date_ymd.day, _date_fract, _tick_skip_counter, _settings_game.economy.day_length_factor, _frame_counter);
+			_cur_date_ymd.year, _cur_date_ymd.month + 1, _cur_date_ymd.day, _date_fract, _tick_skip_counter, DayLengthFactor(), _frame_counter);
 	LogGameLoadDateTimes(buffer, last);
 	if (!_network_server) {
 		extern Date   _last_sync_date;
@@ -738,7 +738,7 @@ char *CrashLog::FillInconsistencyLog(char *buffer, const char *last, const Incon
 	extern uint32_t _frame_counter;
 
 	buffer += seprintf(buffer, last, "In game date: %i-%02i-%02i (%i, %i) (DL: %u), %08X\n",
-			_cur_date_ymd.year, _cur_date_ymd.month + 1, _cur_date_ymd.day, _date_fract, _tick_skip_counter, _settings_game.economy.day_length_factor, _frame_counter);
+			_cur_date_ymd.year, _cur_date_ymd.month + 1, _cur_date_ymd.day, _date_fract, _tick_skip_counter, DayLengthFactor(), _frame_counter);
 	LogGameLoadDateTimes(buffer, last);
 	if (_networking && !_network_server) {
 		extern Date   _last_sync_date;
diff --git a/src/date.cpp b/src/date.cpp
index acf9dc494a..cc85b807fa 100644
--- a/src/date.cpp
+++ b/src/date.cpp
@@ -35,6 +35,7 @@ uint8_t _tick_skip_counter;                ///< Counter for ticks, when only veh
 uint64_t _scaled_tick_counter;             ///< Tick counter in daylength-scaled ticks
 StateTicks _state_ticks;                   ///< Current state tick
 StateTicksDelta _state_ticks_offset;       ///< Offset to add when calculating a StateTicks value from a date/date fract/tick skip counter
+uint8_t _effective_day_length;             ///< Current effective day length
 uint32_t    _quit_after_days;              ///< Quit after this many days of run time
 
 extern void ClearOutOfDateSignalSpeedRestrictions();
@@ -87,7 +88,7 @@ void SetDate(Date date, DateFract fract)
 
 StateTicks GetStateTicksFromCurrentDateWithoutOffset()
 {
-	return ((int64_t)(DateToDateTicks(_date, _date_fract).base()) * _settings_game.economy.day_length_factor) + _tick_skip_counter;
+	return ((int64_t)(DateToDateTicks(_date, _date_fract).base()) * DayLengthFactor()) + _tick_skip_counter;
 }
 
 void RecalculateStateTicksOffset()
@@ -95,6 +96,11 @@ void RecalculateStateTicksOffset()
 	_state_ticks_offset = _state_ticks - GetStateTicksFromCurrentDateWithoutOffset();
 }
 
+void UpdateEffectiveDayLengthFactor()
+{
+	_effective_day_length = _settings_game.EffectiveDayLengthFactor();
+}
+
 #define M(a, b) ((a << 5) | b)
 static const uint16_t _month_date_from_year_day[] = {
 	M( 0, 1), M( 0, 2), M( 0, 3), M( 0, 4), M( 0, 5), M( 0, 6), M( 0, 7), M( 0, 8), M( 0, 9), M( 0, 10), M( 0, 11), M( 0, 12), M( 0, 13), M( 0, 14), M( 0, 15), M( 0, 16), M( 0, 17), M( 0, 18), M( 0, 19), M( 0, 20), M( 0, 21), M( 0, 22), M( 0, 23), M( 0, 24), M( 0, 25), M( 0, 26), M( 0, 27), M( 0, 28), M( 0, 29), M( 0, 30), M( 0, 31),
diff --git a/src/date_func.h b/src/date_func.h
index 40c8c0cfff..4f6bb48791 100644
--- a/src/date_func.h
+++ b/src/date_func.h
@@ -37,6 +37,14 @@ inline Date ConvertYMDToDate(const YearMonthDay &ymd)
 
 #define _cur_year (_cur_date_ymd.year)
 
+inline uint8_t DayLengthFactor()
+{
+	extern uint8_t _effective_day_length;
+	return _effective_day_length;
+}
+
+void UpdateEffectiveDayLengthFactor();
+
 /**
  * Checks whether the given year is a leap year or not.
  * @param yr The year to check.
@@ -49,22 +57,22 @@ inline bool IsLeapYear(Year yr)
 
 inline Date StateTicksToDate(StateTicks ticks)
 {
-	return (ticks.base() - _state_ticks_offset.base()) / (DAY_TICKS * _settings_game.economy.day_length_factor);
+	return (ticks.base() - _state_ticks_offset.base()) / (DAY_TICKS * DayLengthFactor());
 }
 
 inline StateTicks DateToStateTicks(Date date)
 {
-	return ((int64_t)date.base() * DAY_TICKS * _settings_game.economy.day_length_factor) + _state_ticks_offset.base();
+	return ((int64_t)date.base() * DAY_TICKS * DayLengthFactor()) + _state_ticks_offset.base();
 }
 
 inline DateTicks StateTicksToDateTicks(StateTicks ticks)
 {
-	return (ticks.base() - _state_ticks_offset.base()) / _settings_game.economy.day_length_factor;
+	return (ticks.base() - _state_ticks_offset.base()) / DayLengthFactor();
 }
 
 inline StateTicks DateTicksToStateTicks(DateTicks date_ticks)
 {
-	return ((int64_t)date_ticks.base() * _settings_game.economy.day_length_factor) + _state_ticks_offset.base();
+	return ((int64_t)date_ticks.base() * DayLengthFactor()) + _state_ticks_offset.base();
 }
 
 /**
@@ -102,7 +110,7 @@ inline Ticks TimetableDisplayUnitSize()
 	if (_settings_time.time_in_minutes) {
 		return _settings_time.ticks_per_minute;
 	} else {
-		return DAY_TICKS * _settings_game.economy.day_length_factor;
+		return DAY_TICKS * DayLengthFactor();
 	}
 }
 
diff --git a/src/departures.cpp b/src/departures.cpp
index a2ecb1b1ef..8ee0d52ee6 100644
--- a/src/departures.cpp
+++ b/src/departures.cpp
@@ -887,6 +887,6 @@ Ticks GetDeparturesMaxTicksAhead()
 	if (_settings_time.time_in_minutes) {
 		return _settings_client.gui.max_departure_time_minutes * _settings_time.ticks_per_minute;
 	} else {
-		return _settings_client.gui.max_departure_time * DAY_TICKS * _settings_game.economy.day_length_factor;
+		return _settings_client.gui.max_departure_time * DAY_TICKS * DayLengthFactor();
 	}
 }
diff --git a/src/economy.cpp b/src/economy.cpp
index e904160a48..9a3dc4f507 100644
--- a/src/economy.cpp
+++ b/src/economy.cpp
@@ -2731,13 +2731,13 @@ void UpdateCargoScalers()
 {
 	uint town_scale = _settings_game.economy.town_cargo_scale;
 	if (_settings_game.economy.town_cargo_scale_mode == CSM_DAYLENGTH) {
-		town_scale = Clamp<uint>(town_scale * _settings_game.economy.day_length_factor, 1, 5000);
+		town_scale = Clamp<uint>(town_scale * DayLengthFactor(), 1, 5000);
 	}
 	_town_cargo_scaler.SetScale((town_scale << 16) / 100);
 
 	uint industry_scale = _settings_game.economy.industry_cargo_scale;
 	if (_settings_game.economy.industry_cargo_scale_mode == CSM_DAYLENGTH) {
-		industry_scale = Clamp<uint>(industry_scale * _settings_game.economy.day_length_factor, 5, 3000);
+		industry_scale = Clamp<uint>(industry_scale * DayLengthFactor(), 5, 3000);
 	}
 	_industry_cargo_scaler.SetScale((industry_scale << 16) / 100);
 	_industry_inverse_cargo_scaler.SetScale((100 << 16) / std::max<uint>(1, industry_scale));
diff --git a/src/engine.cpp b/src/engine.cpp
index 9f7001e016..db427b9328 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -315,7 +315,7 @@ uint Engine::DetermineCapacity(const Vehicle *v, uint16_t *mail_capacity) const
  */
 Money Engine::GetDisplayRunningCost() const
 {
-	return this->GetRunningCost() * _settings_game.economy.day_length_factor;
+	return this->GetRunningCost() * DayLengthFactor();
 }
 
 /**
diff --git a/src/graph_gui.cpp b/src/graph_gui.cpp
index 66ef746320..c1ab94852c 100644
--- a/src/graph_gui.cpp
+++ b/src/graph_gui.cpp
@@ -1214,16 +1214,16 @@ struct PaymentRatesGraphWindow : BaseGraphWindow {
 			val *= 74;
 			val /= _settings_time.ticks_per_minute;
 		} else {
-			if ((10 % _settings_game.economy.day_length_factor) == 0) {
+			if ((10 % DayLengthFactor()) == 0) {
 				decimals = 0;
-			} else if (_settings_game.economy.day_length_factor > 50) {
+			} else if (DayLengthFactor() > 50) {
 				decimals = 2;
 				val *= 100;
 			} else {
 				decimals = 1;
 				val *= 10;
 			}
-			val /= _settings_game.economy.day_length_factor;
+			val /= DayLengthFactor();
 		}
 		return { val, decimals };
 	}
diff --git a/src/landscape.cpp b/src/landscape.cpp
index 4a977d8be6..b84ea00176 100644
--- a/src/landscape.cpp
+++ b/src/landscape.cpp
@@ -733,10 +733,10 @@ static std::vector<uint> _tile_loop_counts;
 
 void SetupTileLoopCounts()
 {
-	_tile_loop_counts.resize(_settings_game.economy.day_length_factor);
-	if (_settings_game.economy.day_length_factor == 0) return;
+	_tile_loop_counts.resize(DayLengthFactor());
+	if (DayLengthFactor() == 0) return;
 
-	uint64_t count_per_tick_fp16 = (static_cast<uint64_t>(1) << (MapLogX() + MapLogY() + 8)) / _settings_game.economy.day_length_factor;
+	uint64_t count_per_tick_fp16 = (static_cast<uint64_t>(1) << (MapLogX() + MapLogY() + 8)) / DayLengthFactor();
 	uint64_t accumulator = 0;
 	for (uint &count : _tile_loop_counts) {
 		accumulator += count_per_tick_fp16;
@@ -753,7 +753,7 @@ void RunTileLoop(bool apply_day_length)
 {
 	/* We update every tile every 256 ticks, so divide the map size by 2^8 = 256 */
 	uint count;
-	if (apply_day_length && _settings_game.economy.day_length_factor > 1) {
+	if (apply_day_length && DayLengthFactor() > 1) {
 		count = _tile_loop_counts[_tick_skip_counter];
 		if (count == 0) return;
 	} else {
@@ -795,7 +795,7 @@ void RunTileLoop(bool apply_day_length)
 void RunAuxiliaryTileLoop()
 {
 	/* At day lengths <= 4, flooding is handled by main tile loop */
-	if (_settings_game.economy.day_length_factor <= 4 || (_scaled_tick_counter % 4) != 0) return;
+	if (DayLengthFactor() <= 4 || (_scaled_tick_counter % 4) != 0) return;
 
 	PerformanceAccumulator framerate(PFE_GL_LANDSCAPE);
 
diff --git a/src/linkgraph/linkgraph.h b/src/linkgraph/linkgraph.h
index 6c501ed22a..d43d9b8f50 100644
--- a/src/linkgraph/linkgraph.h
+++ b/src/linkgraph/linkgraph.h
@@ -365,7 +365,7 @@ public:
 	 */
 	inline uint Monthly(uint base) const
 	{
-		return (uint)((static_cast<uint64_t>(base) * 30 * DAY_TICKS * _settings_game.economy.day_length_factor) / std::max<uint64_t>((_state_ticks - this->last_compression).base(), DAY_TICKS));
+		return (uint)((static_cast<uint64_t>(base) * 30 * DAY_TICKS * DayLengthFactor()) / std::max<uint64_t>((_state_ticks - this->last_compression).base(), DAY_TICKS));
 	}
 
 	NodeID AddNode(const Station *st);
diff --git a/src/linkgraph/linkgraph_gui.cpp b/src/linkgraph/linkgraph_gui.cpp
index b415117004..c643ee9332 100644
--- a/src/linkgraph/linkgraph_gui.cpp
+++ b/src/linkgraph/linkgraph_gui.cpp
@@ -595,7 +595,7 @@ bool LinkGraphOverlay::ShowTooltip(Point pt, TooltipCloseCondition close_cond)
 						SetDParam(1, time / _settings_time.ticks_per_minute);
 						GetString(builder, STR_LINKGRAPH_STATS_TOOLTIP_TIME_EXTENSION_GENERAL);
 					} else {
-						SetDParam(0, time / (DAY_TICKS * _settings_game.economy.day_length_factor));
+						SetDParam(0, time / (DAY_TICKS * DayLengthFactor()));
 						GetString(builder, STR_LINKGRAPH_STATS_TOOLTIP_TIME_EXTENSION);
 					}
 				}
diff --git a/src/linkgraph/linkgraphschedule.cpp b/src/linkgraph/linkgraphschedule.cpp
index 9f71927b79..e5cde11abd 100644
--- a/src/linkgraph/linkgraphschedule.cpp
+++ b/src/linkgraph/linkgraphschedule.cpp
@@ -319,12 +319,12 @@ void StateGameLoop_LinkGraphPauseControl()
 			DoCommandP(0, PM_PAUSED_LINK_GRAPH, 0, CMD_PAUSE);
 		}
 	} else if (_pause_mode == PM_UNPAUSED && _tick_skip_counter == 0) {
-		if (_settings_game.economy.day_length_factor == 1) {
+		if (DayLengthFactor() == 1) {
 			if (_date_fract != LinkGraphSchedule::SPAWN_JOIN_TICK - 2) return;
 			if (_date.base() % _settings_game.linkgraph.recalc_interval != (_settings_game.linkgraph.recalc_interval / SECONDS_PER_DAY) / 2) return;
 		} else {
 			int date_ticks = (NowDateTicks() - (LinkGraphSchedule::SPAWN_JOIN_TICK - 2)).base();
-			int interval = std::max<int>(2, (_settings_game.linkgraph.recalc_interval * DAY_TICKS / (SECONDS_PER_DAY * _settings_game.economy.day_length_factor)));
+			int interval = std::max<int>(2, (_settings_game.linkgraph.recalc_interval * DAY_TICKS / (SECONDS_PER_DAY * DayLengthFactor())));
 			if (date_ticks % interval != interval / 2) return;
 		}
 
@@ -355,12 +355,12 @@ void OnTick_LinkGraph()
 {
 	int offset;
 	int interval;
-	if (_settings_game.economy.day_length_factor == 1) {
+	if (DayLengthFactor() == 1) {
 		if (_date_fract != LinkGraphSchedule::SPAWN_JOIN_TICK) return;
 		interval = _settings_game.linkgraph.recalc_interval / SECONDS_PER_DAY;
 		offset = _date.base() % interval;
 	} else {
-		interval = std::max<int>(2, (_settings_game.linkgraph.recalc_interval * DAY_TICKS / (SECONDS_PER_DAY * _settings_game.economy.day_length_factor)));
+		interval = std::max<int>(2, (_settings_game.linkgraph.recalc_interval * DAY_TICKS / (SECONDS_PER_DAY * DayLengthFactor())));
 		offset = (NowDateTicks() - LinkGraphSchedule::SPAWN_JOIN_TICK).base() % interval;
 	}
 	if (offset == 0) {
diff --git a/src/openttd.cpp b/src/openttd.cpp
index fc8a702ed6..d7e0cf39d6 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -609,6 +609,7 @@ void MakeNewgameSettingsLive()
 		_settings_game.game_config = new GameConfig(_settings_newgame.game_config);
 	}
 
+	UpdateEffectiveDayLengthFactor();
 	SetupTickRate();
 }
 
@@ -2161,7 +2162,7 @@ void StateGameLoop()
 		}
 
 		RunAuxiliaryTileLoop();
-		if (_tick_skip_counter < _settings_game.economy.day_length_factor) {
+		if (_tick_skip_counter < DayLengthFactor()) {
 			AnimateAnimatedTiles();
 			RunTileLoop(true);
 			CallVehicleTicks();
diff --git a/src/saveload/afterload.cpp b/src/saveload/afterload.cpp
index e0a9367336..8b2abf6a03 100644
--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -669,6 +669,8 @@ bool AfterLoadGame()
 
 	TileIndex map_size = MapSize();
 
+	UpdateEffectiveDayLengthFactor();
+
 	extern TileIndex _cur_tileloop_tile; // From landscape.cpp.
 	/* The LFSR used in RunTileLoop iteration cannot have a zeroed state, make it non-zeroed. */
 	if (_cur_tileloop_tile == 0) _cur_tileloop_tile = 1;
@@ -843,16 +845,17 @@ bool AfterLoadGame()
 	if (IsSavegameVersionBefore(SLV_11, 1) || (IsSavegameVersionBefore(SLV_147) && _date_fract > DAY_TICKS)) _date_fract /= 885;
 
 	if (SlXvIsFeaturePresent(XSLFI_SPRINGPP) || SlXvIsFeaturePresent(XSLFI_JOKERPP) || SlXvIsFeaturePresent(XSLFI_CHILLPP)) {
-		assert(_settings_game.economy.day_length_factor >= 1);
-		_tick_skip_counter = _date_fract % _settings_game.economy.day_length_factor;
-		_date_fract /= _settings_game.economy.day_length_factor;
+		assert(DayLengthFactor() >= 1);
+		_tick_skip_counter = _date_fract % DayLengthFactor();
+		_date_fract /= DayLengthFactor();
 		assert(_date_fract < DAY_TICKS);
-		assert(_tick_skip_counter < _settings_game.economy.day_length_factor);
+		assert(_tick_skip_counter < DayLengthFactor());
 	}
 
 	/* Set day length factor to 1 if loading a pre day length savegame */
 	if (SlXvIsFeatureMissing(XSLFI_VARIABLE_DAY_LENGTH) && SlXvIsFeatureMissing(XSLFI_SPRINGPP) && SlXvIsFeatureMissing(XSLFI_JOKERPP) && SlXvIsFeatureMissing(XSLFI_CHILLPP)) {
 		_settings_game.economy.day_length_factor = 1;
+		UpdateEffectiveDayLengthFactor();
 		if (_file_to_saveload.abstract_ftype != FT_SCENARIO) {
 			/* If this is obviously a vanilla/non-patchpack savegame (and not a scenario),
 			 * set the savegame time units to be in days, as they would have been previously. */
@@ -860,7 +863,7 @@ bool AfterLoadGame()
 		}
 	}
 	if (SlXvIsFeatureMissing(XSLFI_VARIABLE_DAY_LENGTH, 3)) {
-		_scaled_tick_counter = (uint64_t)((_tick_counter * _settings_game.economy.day_length_factor) + _tick_skip_counter);
+		_scaled_tick_counter = (uint64_t)((_tick_counter * DayLengthFactor()) + _tick_skip_counter);
 	}
 	if (SlXvIsFeaturePresent(XSLFI_VARIABLE_DAY_LENGTH, 1, 3)) {
 		_state_ticks = GetStateTicksFromCurrentDateWithoutOffset() + _state_ticks_offset;
@@ -3916,7 +3919,7 @@ bool AfterLoadGame()
 		const StateTicksDelta delta = _state_ticks.base() - (int64_t)_scaled_tick_counter;
 		for (Vehicle *v : Vehicle::Iterate()) {
 			if (v->last_loading_tick != 0) {
-				if (SlXvIsFeaturePresent(XSLFI_LAST_LOADING_TICK, 1, 1)) v->last_loading_tick = v->last_loading_tick.base() * _settings_game.economy.day_length_factor;
+				if (SlXvIsFeaturePresent(XSLFI_LAST_LOADING_TICK, 1, 1)) v->last_loading_tick = v->last_loading_tick.base() * DayLengthFactor();
 				v->last_loading_tick += delta;
 			}
 		}
diff --git a/src/script/api/script_date.cpp b/src/script/api/script_date.cpp
index ff4991200f..9d168483f5 100644
--- a/src/script/api/script_date.cpp
+++ b/src/script/api/script_date.cpp
@@ -30,7 +30,7 @@
 
 /* static */ SQInteger ScriptDate::GetDayLengthFactor()
 {
-	return _settings_game.economy.day_length_factor;
+	return DayLengthFactor();
 }
 
 /* static */ SQInteger ScriptDate::GetYear(ScriptDate::Date date)
diff --git a/src/script/api/script_gamesettings.cpp b/src/script/api/script_gamesettings.cpp
index e5aa8c306b..cd275e5966 100644
--- a/src/script/api/script_gamesettings.cpp
+++ b/src/script/api/script_gamesettings.cpp
@@ -14,6 +14,7 @@
 #include "../../command_type.h"
 #include "../../command_func.h"
 #include "../../economy_func.h"
+#include "../../date_func.h"
 
 #include <optional>
 
@@ -29,7 +30,7 @@ struct CargoScalingProxy {
 		uint64_t scale = this->is_industry ? _settings_game.economy.industry_cargo_scale : _settings_game.economy.town_cargo_scale;
 		CargoScalingMode mode = this->is_industry ? _settings_game.economy.industry_cargo_scale_mode : _settings_game.economy.town_cargo_scale_mode;
 		if (mode == CSM_DAYLENGTH) {
-			scale *= _settings_game.economy.day_length_factor;
+			scale *= DayLengthFactor();
 		}
 		return PercentageToScaleQuantityFactor(scale);
 	}
diff --git a/src/settings_type.h b/src/settings_type.h
index c023d6b801..c038d1cfa3 100644
--- a/src/settings_type.h
+++ b/src/settings_type.h
@@ -887,6 +887,11 @@ struct GameSettings {
 	TimeSettings         game_time;          ///< time display settings.
 
 	OldEconomySettings   old_economy;
+
+	uint8_t EffectiveDayLengthFactor() const
+	{
+		return this->economy.day_length_factor;
+	}
 };
 
 /** All settings that are only important for the local client. */
diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index c6c73cc7c2..375abb0cb3 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -4472,7 +4472,7 @@ void DeleteStaleLinks(Station *from)
 			Station *to = Station::Get((*lg)[to_id].Station());
 			assert(to->goods[c].node == to_id);
 			assert(_date >= edge.LastUpdate());
-			DateDelta timeout = std::max<uint>((LinkGraph::MIN_TIMEOUT_DISTANCE + (DistanceManhattan(from->xy, to->xy) >> 3)) / _settings_game.economy.day_length_factor, 1);
+			DateDelta timeout = std::max<uint>((LinkGraph::MIN_TIMEOUT_DISTANCE + (DistanceManhattan(from->xy, to->xy) >> 3)) / DayLengthFactor(), 1);
 			if (edge.LastAircraftUpdate() != INVALID_DATE && (_date - edge.LastAircraftUpdate()) > timeout) {
 				edge.ClearAircraft();
 			}
@@ -5524,7 +5524,7 @@ void FlowStat::ScaleToMonthly(uint runtime)
 	assert(runtime > 0);
 	uint share = 0;
 	for (iterator i = this->begin(); i != this->end(); ++i) {
-		share = std::max(share + 1, ClampTo<uint>((static_cast<uint64_t>(i->first) * 30 * DAY_TICKS * _settings_game.economy.day_length_factor) / runtime));
+		share = std::max(share + 1, ClampTo<uint>((static_cast<uint64_t>(i->first) * 30 * DAY_TICKS * DayLengthFactor()) / runtime));
 		if (this->unrestricted == i->first) this->unrestricted = share;
 		i->first = share;
 	}
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index d0b10e357f..83244aeef8 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -1313,7 +1313,7 @@ void CallVehicleOnNewDay(Vehicle *v)
 	T::From(v)->T::OnNewDay();
 
 	/* Vehicle::OnPeriodic is decoupled from Vehicle::OnNewDay at day lengths >= 8 */
-	if (_settings_game.economy.day_length_factor < 8) T::From(v)->T::OnPeriodic();
+	if (DayLengthFactor() < 8) T::From(v)->T::OnPeriodic();
 }
 
 /**
@@ -1529,7 +1529,7 @@ void CallVehicleTicks()
 
 	if (_tick_skip_counter == 0) RunVehicleDayProc();
 
-	if (_settings_game.economy.day_length_factor >= 8 && _game_mode == GM_NORMAL) {
+	if (DayLengthFactor() >= 8 && _game_mode == GM_NORMAL) {
 		/*
 		 * Vehicle::OnPeriodic is decoupled from Vehicle::OnNewDay at day lengths >= 8
 		 * Use a fixed interval of 512 ticks (unscaled) instead
diff --git a/src/vehicle_base.h b/src/vehicle_base.h
index 7830ce7dc1..b888e30c0e 100644
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -693,7 +693,7 @@ public:
 	 * Gets the running cost of a vehicle  that can be sent into SetDParam for string processing.
 	 * @return the vehicle's running cost
 	 */
-	Money GetDisplayRunningCost() const { return (this->GetRunningCost() >> 8) * _settings_game.economy.day_length_factor; }
+	Money GetDisplayRunningCost() const { return (this->GetRunningCost() >> 8) * DayLengthFactor(); }
 
 	/**
 	 * Gets the profit vehicle had this year. It can be sent into SetDParam for string processing.
diff --git a/src/water_cmd.cpp b/src/water_cmd.cpp
index 61f36493d5..5f3cad4434 100644
--- a/src/water_cmd.cpp
+++ b/src/water_cmd.cpp
@@ -1341,7 +1341,7 @@ void TileLoop_Water(TileIndex tile)
 	if (IsTileType(tile, MP_WATER)) AmbientSoundEffect(tile);
 
 	/* At day lengths > 4, handle flooding in auxiliary tile loop */
-	if (_settings_game.economy.day_length_factor > 4 && _game_mode != GM_EDITOR) return;
+	if (DayLengthFactor() > 4 && _game_mode != GM_EDITOR) return;
 
 	if (IsNonFloodingWaterTile(tile)) return;