I was thinking of this a few months ago!I dont think the boxing board would ever change now!It does stand true that there is more of a chance a fighter could sustain more damage as the fight progresses.At the end of the day what the main aim is in the pro game of boxing is to cause maxium damage to your opponant.12rounds are spot on!Like you mention its a hour of pure action,thats enough time to enjoy a fight!!!