And I see a Warrior's Berserk is about to wear off.

How do I time my Esuna/Leeches/Exalted to remove Pacification as soon as it pops up? I've tried a few times but I've always been too early and ended up casting again to remove it at the ever-useless 1 second mark.

I know that the timer ticks 1 - blank - Pacification, so when do I start casting?

(Any assumptions you have might be right: if I have time for this then I'm not in raid content. I've healed 100% dungeons and trial roulette primals so far. Nothing beyond that. Not even Coil or old EX primals. Still, it'd be nice to know.)