How can I get rid of mission timers?

There are several mods that do this or something similar:

The Disable Timers mod on Steam Workshop disables timers altogether.
The Timer Tweaks mod increases the time-limits to make them less stressful.
The True Concealment mod makes timers only start counting down once you've been revealed.
- There is a second version of True Concealment which reduces the time-limits to compensate for the extra time.

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