Depends on a lot of things including his physiology, his mental state, how recently and frequently he has had sex/masturbated, etc.
Largely, it depends on how sensitive he is down there. Some guys are really sensitve and really have to sweat to last more than 30 seconds of constant pumping...
guys are pigs for looking at em? Beautiful girls that wear tight tops that accentuate their boobs and cleavage, etc. Then if a guy looks at her "features" he's called a creep, pig, or whatever other derogatory term.
What the heck??