My Idea of How To Buff Sage

[Rongway]

it WAS time based on release (10s duration) but it got changed to 4 stacks for whatever reason, probably something about low spellspeed causing you to lose that 4th hit or such

I think the reason they changed it to stacks was to be more forgiving when healers would cast GCD heals during the duration, forfeiting Soteria-buffed attacks.