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Disable Timers

A new War of the Chosen compatible version of this mod is available here:
http://steamcommunity.com/sharedfiles/filedetails/?id=1125412463

Disables the vanilla game mission timer in most non-story missions. Notable exceptions are UFO and terror missions.
As this removes a big element of the game, you may want to crank up the difficulty a notch to compensate.
This mod does not disable achievements.

If you stumble upon any bugs or missions types that I've missed, please report them in the comments below.

A campaign reset should not be neccessary, but it is recommended. If you decide not to restart, it's a good idea to back up your save before you enable this mod.
You can find your saves at C:\Users\ Profile name \Documents\my games\XCOM2\XComGame\SaveData
Once you save your game with this mod enabled, it will no longer be possible to load the save without it.

If you were looking to alter the Doomsday clock, check out this thread by Ez- http://steamcommunity.com/app/268500/discussions/0/412446292764413464/