Twelve rounds--15 rounds----Those three rounds do make a difference....They will always favor the guy with the bset cardio.....

Here is something crazy......

I have a boxing encyclopedia that talks about a fight back in the late or middle 1800's I think it was (I would have to look it up again) where two guys fought for 24 hours....The actually took a break after like 17 or 18 hours so the fans could sleep then resumed the fight in the morning!!!