I remember something.

The mod works for the first mission but I don't see the clock.

Then, for the nexts missions I see the clock but the countdown is active at the first round.

My XCOMengine.ini is "read-only" (I need some tweaks to have the game playable). Could it be the problem?

The first mission in a new campaign does not have a timer, even without mods.
The mod does not work in the second mission from a fresh start if you have the tutorial enabled.

Ok the first mission.

I'm not playing with tutorial. I'm playing in Veteran and Ironman mode.
So my second mission is, I think, a "real" mission.

Is the timer correctly reduced? Do you have any other mods on? And what mission is it?

I just tested it myself and it seems to work from a new sub.

Physically reduced? No. I have the vanilla timer.

Your mod was the first I tried. Then I tried the "face painting" mod and it won't load too.

Maybe a particular problem with y installation. . . still investigating.

Ok, got it.

For those who have the problem (tested on a Linux system).

1. Install the mods via the Steam workshop. The mods are installed here :
~/.local/share/feral-interactive/XCOM2/VFS/Local/mods_lowercase/268500_lowered
(for info, a folder mod name is like : 577409322)

2. Then create a folder "mods" here :
~/.local/share/Steam/steamapps/common/XCOM 2/share/data/xcomgame

3. Copy/paste all the mods presents in ~/.local/share/feral-interactive/XCOM2/VFS/Local/mods_lowercase/268500_lowered to ~/.local/share/Steam/steamapps/common/XCOM 2/share/data/xcomgame/mods/

4. Run the Firaxis launcher and go to the "mods" tab. You will see the mods two times.
For example "True Concealment" and "trueconcealment".
Activate the lowercase one ("trueconcealment").

5. Run the game.

This works for me.

What if the mod is aumtomatic updated via the Workshop? I don't know.
Copy/paste the updated folder to ../mods location? Maybe. . . developpers might answer this question.

I have the mod and my timers are reduced by they still tick down in Concealment. So now I just have brutally difficult turn timers even in Concealment mode =(

Has this been fixed yet? I'd like to try this out

Well, I have no problem on linux and the last update (v1.0.1) fixes the mods detecting problem.

Cant get it to work. Timer decreased, but its still ticking down while concealed. Win 7

Not working for me too :/

nvm got it to work now o-o probably a patch issue had to restart and reactivate

Not working for me now. The mission timers are dropping each turn regardless of the mod and mission type.

Same here. Still in concealment and turns be dropping away. Please, Takeru, if you have the time please try and see what is causing this problem. This has been one of the most fitting mods in XCOM 2 for me to enjoying creeping up the the Ayyyys slowly and then brining dow the wrath.

This mod just makes sense. Your team ropes in from an aircraft most missions. If Advent didn't see that, and aren't already on alert because of it, then it makes no sense to count down for reinforcements (or other time-limiting consequences) for a threat who's presence is unknown. If the air evac hovering nearby is what tips Advent off you're there, then why should your actions on the ground even matter?

What's even worse is that mission where you have to hack the network before it is "shut down" (why shut it down when you don't know anyone is coming?), but the second phase of the mission is eliminating any remaining Advent after doing so - and there's no timer for that! Advent troopers have freaking psionic comm chips in their skulls and yet they CAN'T call for reinforcements with them?! Huh?!

Anyway after you are revealed, it DOES make sense to have a timer as that's when you'd call reinforcements and start doing things like shutting down network nodes and destroying sensitive data. So this mod is perfect!

Well, almost. You can be revealed while in full cover, without being in line of sight of an enemy or civilian, if you're in a certain radius to them. Even through walls. So enemies that couldn't aim at you can still "detect" you. Again, huh? Does everyone - even civilians - have psionic powers of sensing through walls and such?

This mod would be PERFECT if line of sight was necessary to break cover! Think about it: the definition of full cover is that no center mass is exposed. How does a civilian or run of the mill Advent trooper "detect" you through a wall, just because you're nearby? Or even see you if their back is turned, you're in full cover, but you're one square too close. If it was possible to incorporate line of sight requirements for breaking cover, that would the crowning achievement of modding!

Well, that and me being able to use any mod with Linux; I haven't managed to get a single mod working with my Linux install.

Anyway, I'm just jealous I don't have the skills to make mods like this. I hope [mod creator] will keep this one up to date with the game patches and great work with this (I can safely assume).