As inquisition only lasts for 30 seconds you can only get to 3 HP a certain amount of times before it wears off, and each set of holy power can vary from 5 seconds after using it, to 15 seconds after using it.
So when would be the most ideal time on it's 30 second timer to reapply inquisition instead of using templars verdict, as you may think you have enough time to get to 3 HP again after using it, but you lose some time when it's not up, and if you keep doing this it may severly reduce your overall damage.
I would like to get a nice discussion thread going about this, and maybe expand on this by incorporating some other factors.
Riddicule, Aman' Thul.