Index: src/aircraft_cmd.cpp
===================================================================
--- src/aircraft_cmd.cpp	(revision 10499)
+++ src/aircraft_cmd.cpp	(working copy)
@@ -740,7 +740,7 @@
 
 	if (v->vehstatus & VS_STOPPED) return;
 
-	CommandCost cost = CommandCost(GetVehicleProperty(v, 0x0E, AircraftVehInfo(v->engine_type)->running_cost) * _price.aircraft_running / 364);
+	CommandCost cost = CommandCost(GetVehicleProperty(v, 0x0E, AircraftVehInfo(v->engine_type)->running_cost) * _price.aircraft_running * EconomyMultiplier() / 364);
 
 	v->profit_this_year -= cost.GetCost() >> 8;
 
Index: src/aircraft_gui.cpp
===================================================================
--- src/aircraft_gui.cpp	(revision 10499)
+++ src/aircraft_gui.cpp	(working copy)
@@ -91,7 +91,7 @@
 
 			SetDParam(0, (v->age + 365 < v->max_age) ? STR_AGE : STR_AGE_RED);
 			SetDParam(2, v->max_age / 366);
-			SetDParam(3, _price.aircraft_running * AircraftVehInfo(v->engine_type)->running_cost >> 8);
+			SetDParam(3, _price.aircraft_running * AircraftVehInfo(v->engine_type)->running_cost * EconomyMultiplier() >> 8);
 			DrawString(2, 15, STR_A00D_AGE_RUNNING_COST_YR, 0);
 		}
 
Index: src/build_vehicle_gui.cpp
===================================================================
--- src/build_vehicle_gui.cpp	(revision 10499)
+++ src/build_vehicle_gui.cpp	(working copy)
@@ -485,7 +485,7 @@
 	}
 
 	/* Running cost */
-	SetDParam(0, (GetEngineProperty(engine_number, 0x0D, rvi->running_cost_base) * _price.running_rail[rvi->running_cost_class] >> 8) << multihead);
+	SetDParam(0, (GetEngineProperty(engine_number, 0x0D, rvi->running_cost_base) * _price.running_rail[rvi->running_cost_class]  * EconomyMultiplier() >> 8) << multihead);
 	DrawString(x, y, STR_PURCHASE_INFO_RUNNINGCOST, 0);
 	y += 10;
 
@@ -512,7 +512,7 @@
 	y += 10;
 
 	/* Running cost */
-	SetDParam(0, rvi->running_cost * _price.roadveh_running >> 8);
+	SetDParam(0, rvi->running_cost * _price.roadveh_running * EconomyMultiplier() >> 8);
 	DrawString(x, y, STR_PURCHASE_INFO_RUNNINGCOST, 0);
 	y += 10;
 
@@ -543,7 +543,7 @@
 	y += 10;
 
 	/* Running cost */
-	SetDParam(0, GetEngineProperty(engine_number, 0x0F, svi->running_cost) * _price.ship_running >> 8);
+	SetDParam(0, GetEngineProperty(engine_number, 0x0F, svi->running_cost) * _price.ship_running * EconomyMultiplier() >> 8);
 	DrawString(x, y, STR_PURCHASE_INFO_RUNNINGCOST, 0);
 	y += 10;
 
@@ -578,7 +578,7 @@
 	y += 10;
 
 	/* Running cost */
-	SetDParam(0, GetEngineProperty(engine_number, 0x0E, avi->running_cost) * _price.aircraft_running >> 8);
+	SetDParam(0, GetEngineProperty(engine_number, 0x0E, avi->running_cost) * _price.aircraft_running * EconomyMultiplier() >> 8);
 	DrawString(x, y, STR_PURCHASE_INFO_RUNNINGCOST, 0);
 	y += 10;
 
Index: src/date.cpp
===================================================================
--- src/date.cpp	(revision 10499)
+++ src/date.cpp	(working copy)
@@ -217,7 +217,7 @@
 	uint total = GetMaxVehicleIndex() + 1;
 	uint i;
 
-	for (i = daytick; i < total; i += DAY_TICKS) {
+	for (i = daytick; i < total; i += DaylengthMultiplier()) {
 		Vehicle *v = GetVehicle(i);
 
 		if (IsValidVehicle(v)) _on_new_vehicle_day_proc[v->type](v);
@@ -239,7 +239,7 @@
 	_tick_counter++;
 
 	_date_fract++;
-	if (_date_fract < DAY_TICKS) return;
+	if (_date_fract < DaylengthMultiplier()) return;
 	_date_fract = 0;
 
 	/* yeah, increase day counter and call various daily loops */
Index: src/engine_gui.cpp
===================================================================
--- src/engine_gui.cpp	(revision 10499)
+++ src/engine_gui.cpp	(working copy)
@@ -126,7 +126,7 @@
 	SetDParam(3, rvi->power << multihead);
 	SetDParam(1, rvi->weight << multihead);
 
-	SetDParam(4, rvi->running_cost_base * _price.running_rail[rvi->running_cost_class] >> 8 << multihead);
+	SetDParam(4, rvi->running_cost_base * _price.running_rail[rvi->running_cost_class] * EconomyMultiplier() >> 8 << multihead);
 
 	if (rvi->capacity != 0) {
 		SetDParam(5, rvi->cargo_type);
@@ -144,7 +144,7 @@
 	SetDParam(1, avi->max_speed * 10 / 16);
 	SetDParam(2, avi->passenger_capacity);
 	SetDParam(3, avi->mail_capacity);
-	SetDParam(4, avi->running_cost * _price.aircraft_running >> 8);
+	SetDParam(4, avi->running_cost * _price.aircraft_running * EconomyMultiplier() >> 8);
 
 	DrawStringMultiCenter(x, y, STR_A02E_COST_MAX_SPEED_CAPACITY, maxw);
 }
@@ -155,7 +155,7 @@
 
 	SetDParam(0, (_price.roadveh_base >> 3) * rvi->base_cost >> 5);
 	SetDParam(1, rvi->max_speed * 10 / 32);
-	SetDParam(2, rvi->running_cost * _price.roadveh_running >> 8);
+	SetDParam(2, rvi->running_cost * _price.roadveh_running * EconomyMultiplier() >> 8);
 	SetDParam(3, rvi->cargo_type);
 	SetDParam(4, rvi->capacity);
 
@@ -169,7 +169,7 @@
 	SetDParam(1, svi->max_speed * 10 / 32);
 	SetDParam(2, svi->cargo_type);
 	SetDParam(3, svi->capacity);
-	SetDParam(4, svi->running_cost * _price.ship_running >> 8);
+	SetDParam(4, svi->running_cost * _price.ship_running * EconomyMultiplier() >> 8);
 	DrawStringMultiCenter(x, y, STR_982E_COST_MAX_SPEED_CAPACITY, maxw);
 }
 
Index: src/graph_gui.cpp
===================================================================
--- src/graph_gui.cpp	(revision 10499)
+++ src/graph_gui.cpp	(working copy)
@@ -1079,7 +1079,7 @@
 				if (p2->is_active) UpdateCompanyRatingAndValue(p2, false);
 			}
 
-			w->custom[0] = DAY_TICKS;
+			w->custom[0] = DaylengthMultiplier();
 			w->custom[1] = 5;
 
 			if (_performance_rating_detail_player != INVALID_PLAYER) LowerWindowWidget(w, _performance_rating_detail_player + 13);
@@ -1091,7 +1091,7 @@
 		case WE_TICK:
 			/* Update the player score every 5 days */
 			if (--w->custom[0] == 0) {
-				w->custom[0] = DAY_TICKS;
+				w->custom[0] = DaylengthMultiplier();
 				if (--w->custom[1] == 0) {
 					Player *p2;
 
Index: src/lang/english.txt
===================================================================
--- src/lang/english.txt	(revision 10499)
+++ src/lang/english.txt	(working copy)
@@ -1175,6 +1175,8 @@
 STR_CONFIG_PATCHES_LARGER_TOWNS                                 :{LTBLUE}Proportion of towns that will become cities: {ORANGE}1 in {STRING1}
 STR_CONFIG_PATCHES_LARGER_TOWNS_DISABLED                        :{LTBLUE}Proportion of towns that will become cities: {ORANGE}None
 STR_CONFIG_PATCHES_CITY_SIZE_MULTIPLIER                         :{LTBLUE}Initial city size multiplier: {ORANGE}{STRING1}
+STR_CONFIG_PATCHES_DAY_LENGTH_MULTIPLIER                        :{LTBLUE}Length of days (2,22 Sec * Setting): {ORANGE}{STRING1}
+STR_CONFIG_PATCHES_DAY_LENGTH_CORRECTION                        :{LTBLUE}Length of days affects economy
 
 STR_CONFIG_PATCHES_GUI                                          :{BLACK}Interface
 STR_CONFIG_PATCHES_CONSTRUCTION                                 :{BLACK}Construction
Index: src/network/network.h
===================================================================
--- src/network/network.h	(revision 10499)
+++ src/network/network.h	(working copy)
@@ -3,7 +3,7 @@
 #ifndef NETWORK_H
 #define NETWORK_H
 
-#define NOREV_STRING "norev000"
+#define NOREV_STRING "r10499-daypatch"
 
 #ifdef ENABLE_NETWORK
 
Index: src/players.cpp
===================================================================
--- src/players.cpp	(revision 10499)
+++ src/players.cpp	(working copy)
@@ -504,7 +504,7 @@
 void StartupPlayers()
 {
 	/* The AI starts like in the setting with +2 month max */
-	_next_competitor_start = _opt.diff.competitor_start_time * 90 * DAY_TICKS + RandomRange(60 * DAY_TICKS) + 1;
+	_next_competitor_start = _opt.diff.competitor_start_time * 90 * DaylengthMultiplier() + RandomRange(60 * DaylengthMultiplier()) + 1;
 }
 
 static void MaybeStartNewPlayer()
@@ -530,8 +530,8 @@
 	}
 
 	/* The next AI starts like the difficulty setting said, with +2 month max */
-	_next_competitor_start = _opt.diff.competitor_start_time * 90 * DAY_TICKS + 1;
-	_next_competitor_start += _network_server ? InteractiveRandomRange(60 * DAY_TICKS) : RandomRange(60 * DAY_TICKS);
+	_next_competitor_start = _opt.diff.competitor_start_time * 90 * DaylengthMultiplier() + 1;
+	_next_competitor_start += _network_server ? InteractiveRandomRange(60 * DaylengthMultiplier()) : RandomRange(60 * DaylengthMultiplier());
 }
 
 void InitializePlayers()
Index: src/roadveh_cmd.cpp
===================================================================
--- src/roadveh_cmd.cpp	(revision 10499)
+++ src/roadveh_cmd.cpp	(working copy)
@@ -1969,7 +1969,7 @@
 		}
 	}
 
-	cost = RoadVehInfo(v->engine_type)->running_cost * _price.roadveh_running / 364;
+	cost = RoadVehInfo(v->engine_type)->running_cost * _price.roadveh_running * EconomyMultiplier() / 364;
 
 	v->profit_this_year -= cost.GetCost() >> 8;
 
Index: src/roadveh_gui.cpp
===================================================================
--- src/roadveh_gui.cpp	(revision 10499)
+++ src/roadveh_gui.cpp	(working copy)
@@ -91,7 +91,7 @@
 
 			SetDParam(0, (v->age + 365 < v->max_age) ? STR_AGE : STR_AGE_RED);
 			SetDParam(2, v->max_age / 366);
-			SetDParam(3, RoadVehInfo(v->engine_type)->running_cost * _price.roadveh_running >> 8);
+			SetDParam(3, RoadVehInfo(v->engine_type)->running_cost * _price.roadveh_running * EconomyMultiplier() >> 8);
 			DrawString(2, 15, STR_900D_AGE_RUNNING_COST_YR, 0);
 		}
 
Index: src/saveload.cpp
===================================================================
--- src/saveload.cpp	(revision 10499)
+++ src/saveload.cpp	(working copy)
@@ -30,7 +30,8 @@
 #include <setjmp.h>
 #include <list>
 
-extern const uint16 SAVEGAME_VERSION = 69;
+extern const uint16 SAVEGAME_VERSION = 70;
+
 uint16 _sl_version;       ///< the major savegame version identifier
 byte   _sl_minor_version; ///< the minor savegame version, DO NOT USE!
 
Index: src/settings.cpp
===================================================================
--- src/settings.cpp	(revision 10499)
+++ src/settings.cpp	(working copy)
@@ -1431,7 +1431,8 @@
 	SDT_CONDVAR(Patches, town_growth_rate,  SLE_UINT8, 54, SL_MAX_VERSION, 0, MS, 2, 0,   4, 0, STR_CONFIG_PATCHES_TOWN_GROWTH,          NULL),
 	SDT_CONDVAR(Patches, larger_towns,      SLE_UINT8, 54, SL_MAX_VERSION, 0, D0, 4, 0, 255, 1, STR_CONFIG_PATCHES_LARGER_TOWNS,         NULL),
 	SDT_CONDVAR(Patches, initial_city_size, SLE_UINT8, 56, SL_MAX_VERSION, 0, 0,  2, 1,  10, 1, STR_CONFIG_PATCHES_CITY_SIZE_MULTIPLIER, NULL),
-
+	 SDT_CONDVAR(Patches, daylength_multiplier, SLE_UINT8, 70, SL_MAX_VERSION, 0,NC,  1,1,30,1,  STR_CONFIG_PATCHES_DAY_LENGTH_MULTIPLIER, NULL),
+	SDT_CONDBOOL(Patches, daylength_correction, 70, SL_MAX_VERSION,       0, 0, false,            STR_CONFIG_PATCHES_DAY_LENGTH_CORRECTION,   NULL),
 	/***************************************************************************/
 	/* AI section of the GUI-configure patches window */
 	SDT_BOOL(Patches, ainew_active,           0, 0, false, STR_CONFIG_PATCHES_AINEW_ACTIVE,      AiNew_PatchActive_Warning),
Index: src/settings_gui.cpp
===================================================================
--- src/settings_gui.cpp	(revision 10499)
+++ src/settings_gui.cpp	(working copy)
@@ -698,6 +698,8 @@
 	"town_growth_rate",
 	"larger_towns",
 	"initial_city_size",
+	"daylength_multiplier",
+	"daylength_correction",
 };
 
 static const char *_patches_ai[] = {
Index: src/ship_cmd.cpp
===================================================================
--- src/ship_cmd.cpp	(revision 10499)
+++ src/ship_cmd.cpp	(working copy)
@@ -189,7 +189,7 @@
 
 	if (v->vehstatus & VS_STOPPED) return;
 
-	cost.AddCost(GetVehicleProperty(v, 0x0F, ShipVehInfo(v->engine_type)->running_cost) * _price.ship_running / 364);
+	cost.AddCost(GetVehicleProperty(v, 0x0F, ShipVehInfo(v->engine_type)->running_cost) * _price.ship_running * EconomyMultiplier() / 364);
 	v->profit_this_year -= cost.GetCost() >> 8;
 
 	SET_EXPENSES_TYPE(EXPENSES_SHIP_RUN);
Index: src/ship_gui.cpp
===================================================================
--- src/ship_gui.cpp	(revision 10499)
+++ src/ship_gui.cpp	(working copy)
@@ -49,7 +49,7 @@
 
 			SetDParam(0, (v->age + 365 < v->max_age) ? STR_AGE : STR_AGE_RED);
 			SetDParam(2, v->max_age / 366);
-			SetDParam(3, ShipVehInfo(v->engine_type)->running_cost * _price.ship_running >> 8);
+			SetDParam(3, ShipVehInfo(v->engine_type)->running_cost * _price.ship_running * EconomyMultiplier() >> 8);
 			DrawString(2, 15, STR_9812_AGE_RUNNING_COST_YR, 0);
 		}
 
Index: src/timetable_gui.cpp
===================================================================
--- src/timetable_gui.cpp	(revision 10499)
+++ src/timetable_gui.cpp	(working copy)
@@ -40,7 +40,7 @@
 		SetDParam(param2, time);
 	} else {
 		SetDParam(param1, STR_TIMETABLE_DAYS);
-		SetDParam(param2, time / DAY_TICKS);
+		SetDParam(param2, time / DaylengthMultiplier());
 	}
 }
 
@@ -192,7 +192,7 @@
 	}
 	y += 10;
 
-	if (v->lateness_counter == 0 || (!_patches.timetable_in_ticks && v->lateness_counter / DAY_TICKS == 0)) {
+	if (v->lateness_counter == 0 || (!_patches.timetable_in_ticks && v->lateness_counter / DaylengthMultiplier() == 0)) {
 		DrawString(2, y, STR_TIMETABLE_STATUS_ON_TIME, 0x10);
 	} else {
 		SetTimetableParams(0, 1, abs(v->lateness_counter));
@@ -244,7 +244,7 @@
 
 					if (order != NULL) {
 						uint time = (selected % 2 == 1) ? order->travel_time : order->wait_time;
-						if (!_patches.timetable_in_ticks) time /= DAY_TICKS;
+						if (!_patches.timetable_in_ticks) time /= DaylengthMultiplier();
 
 						if (time != 0) {
 							SetDParam(0, time);
@@ -278,7 +278,7 @@
 			uint32 p1 = PackTimetableArgs(v, WP(w,order_d).sel);
 
 			uint64 time = StrEmpty(we->we.edittext.str) ? 0 : strtoul(we->we.edittext.str, NULL, 10);
-			if (!_patches.timetable_in_ticks) time *= DAY_TICKS;
+			if (!_patches.timetable_in_ticks) time *= DaylengthMultiplier();
 
 			uint32 p2 = minu(time, MAX_UVALUE(uint16));
 
Index: src/train_gui.cpp
===================================================================
--- src/train_gui.cpp	(revision 10499)
+++ src/train_gui.cpp	(working copy)
@@ -421,7 +421,7 @@
 
 	SetDParam(0, (v->age + 365 < v->max_age) ? STR_AGE : STR_AGE_RED);
 	SetDParam(2, v->max_age / 366);
-	SetDParam(3, GetTrainRunningCost(v) >> 8);
+	SetDParam(3, GetTrainRunningCost(v) * EconomyMultiplier() >> 8);
 	DrawString(x, 15, STR_885D_AGE_RUNNING_COST_YR, 0);
 
 	SetDParam(2, v->u.rail.cached_max_speed * 10 / 16);
Index: src/variables.h
===================================================================
--- src/variables.h	(revision 10499)
+++ src/variables.h	(working copy)
@@ -13,6 +13,7 @@
 #endif
 
 #include "gfx.h"
+#include "date.h"
 
 /* Prices and also the fractional part. */
 VARDEF Prices _price;
@@ -241,6 +242,9 @@
 
 	bool timetabling;        ///< Whether to allow timetabling.
 	bool timetable_in_ticks; ///< Whether to show the timetable in ticks rather than days.
+
+	byte daylength_multiplier; ///< Allows to set the daylength
+	bool daylength_correction; ///< Economy changes according to the daylength set
 };
 
 VARDEF Patches _patches;
@@ -400,4 +404,8 @@
 /* Forking stuff */
 VARDEF bool _dedicated_forks;
 
+/* Economy calculations for different daylengths */
+inline uint16 DaylengthMultiplier() { return DAY_TICKS * _patches.daylength_multiplier; }
+inline uint16 EconomyMultiplier() { return _patches.daylength_correction ? _patches.daylength_multiplier : 1; }
+
 #endif /* VARIABLES_H */