There's 2 ways I plan on building him. One way is to do a lot of damage without gunzerking, and the other is to be gunzerking very often. Before I even plan on building him that way though, I need to know HOW LONG do you gunzerk for? I know the cooldown time is 42 seconds, but they don't say how long it lasts. Anyone know? --- I have Dysarthria. It's a Speech problem. Your question is answered now.