Operative as healer with tank companion: level 47
normal one on one: 2 gcds
3 normals 15-20 seconds(cooldown on headshot ability)
Strong 10-15 seconds
elites 40 ish seconds
Champion mobs depends on hp but usually they go down(perma healing a tank companion who is killing them doing a auttoattack every 5 seconds doesn't make it faster)