bosses boost 250% bufs

Hello Warmane Team i have couple of questions for us new lvl 80`s doing hcs and reps gearing up and get rdy to do OS or Nax its just insane to do it becouse some bosses have 5-6 mil hp and when you google it they need to have 2.2 mil... so how long will it take forever or?? second question is in Heroics how mobs can do more dmg then boss ??? 3-4-5 k per hit on tank? will you ever fix this things or it will get more wors.. sorry for bad english hope you undersand questions and i hope post will not be deleted..

This isn't "bugged," it was made that way intentionally so it wouldn't be steamrolled by people. It's meant to be challenging.
About how long it would take, you can ask the people who have killed those bosses.