Quote Originally Posted by BigMoney View Post
Without class bonuses (Agent, etc), Energy recovers at a rate of 3 energy/1 min (per 54 seconds with class bonus), stamina recovers at 1 bullet/3 min (per 2:42 with class bonus).

HP for syndicate battles and boss events recovers at 1HP per min, and takes 25HP for one attack. I don't believe there are any health modifiers.
That's what I was asking, about the syndicate battle and boss health recovery...