[b][size=150]Infos[/size][/b]
[list]
[*]Type: Mod
[*]Name: DayNightExtender 
[*]Description: Increase the length of day and night cycle. Vanilla length is around 7 mins. The extender multiplies this by x4 to 28 mins. This multiplier is customizable in config.lua.
[*]Tested-With-Factorio-Version: 0.13.0
[*]Multiplayer compatible: not tested
[*]Locale: none
[*]Tags: Time, clock, day length, slowtime.
[*]License: MIT.
[*]Authors : Dark, Vizzy, Mikenlott, BinbinHfr
[*]Portal download : https://mods.factorio.com/mods/binbinhfr/DayNightExtender[/list]

[spoiler=To Use]The default, modded day/night length is 4x the vanilla length.

Vanilla: 7 minutes for full day and night cycle 
Modded: 28 minutes for full day and night cycle

With the mod, the game-minutes are ticking close to real seconds.

If you wish to change the modded values, you just have to change the value of day_length_multiplier in the config.lua file.[/spoiler]
[spoiler=Limitations]- Can only increase day/night length in blocks of 7 minutes. Unfortunately decreasing the length or finer granularity is not possible.
- If you are using a mod that display the clocl (like [url=https://forums.factorio.com/viewtopic.php?f=92&t=22822]TimeTools[/url], you will see that the clock is ticking slower and sometimes not very regularly. That's not a bug : DayNightExtender is constantly playing with the clock, freezing/unfreezing it, in order to give a fake slowtime effect.[/spoiler]