I believe you are asking for a figure that would be hard to calculate. Take for instance this Excerpt from "The Power Of The Dragon":
"He [Bruce Lee] was constantly training. When he watched TV or went to the movies, he conditioned his knuckles. When he was driving, he worked the hand grips. If he walked to a bookstore and came to a hill, he always ran. He never wasted time."
http://www.scribd.com/doc/7215/Marti...ength-Training
I think it's safe to say he worked out as long as he was awake
Parsec