Quick and Quiet - token based
You do not make as much noise as others when quickly vaulting over obstacles or hiding in lockers. You start the trial with 3 tokens. For each token:
The vault and hide actions noise detection and audio range is reduced by 100%
When all tokens are consumed you will recover for 40 seconds. After the recovery you gain 3 new tokens.
So the idea is to use this perk more than once every 20 seconds. And of course making it better, just a little bit. Means one token is "for free" because now you can just use it once every 20 seconds which would result in a 60 seconds cooldown and that's way too long.
Comments
This perk has a cooldown of 20 seconds for balance reasons.
I see no reason to change Quick & Quiet. 20 seconds are a very short cool-down duration as is.