18 rounds in at least 12oz padded gloves.
As I said earlier, Rocky's hands are likely smashed to dust from age and action. Fact: Rocky's defense was shit, Quan and if anyone was the professional punching bag: It was actually Rocky, who's strategy was: "Go the distance and hang on whilst having the shit punched out of him, until the other guy is exhausted before making the capitalising flurry". This is why you fail/cry.