I seriously don't think it would last even 30 seconds. Keep in mind that Bruce Lee was trained in the Shaolin fighting style of Wing Chun and studied just about every fighting discipline known to man-including boxing. He synthesized these elements of the East and West and formed his own fighting system Jeet Kune Do. Brute strength means nothing, which is why seemingly fragile looking men can smash bricks and 300 lb bodybuilders wouldn't even attempt it. Bruce, while only 135 lbs or so, hit with the force of a 300 lb man as evidenced by his famous "1 inch punch". He would have never won an Oscar but his fighting skill and ability had made him a legend in the martial arts world before he ever hit the big screen. His talent was a once in a lifetime deal. Even Stallone would be smart enough to admit that it would be a no contest regardless of how big or ripped he looked.