Hold Breath works for just under 10 seconds, this is very unrealistic and extremely frustrating. Specially with the new fatigue rules, this otherwise very useful countermeasure to the mad sway of weapons after an ill-advised sprint is all but useless.
It does not provide the needed stability for even a crudely adequate amount of time.
For a play-testing exercise, I decided to hold my own breath together with the right mouse button in multiple scenarios. This provided a very interesting feedback to just how long and often this feature could be used. (allowing for my typical gamer-chair fitness, of course)
It was then very clear that soldiers in ArmA are all suffering from extreme lung conditions and under no circumstances should pass a medical for frontline deployment.
I strongly urge that the timing values governing the duration of "Hold Breath" are increased. Recommend a factor of 2x at least, as well as a 1/2 reduced cooldown/catch-breath period