35 hrs, facetious if your consider that he has had a racquet in his hand since he could walk. Then he doesn't train either.
Nadal looked gone physically a few years back, so its impressive that he can stare down a player on class alone. Then again, if your young and in the semis of a grand slam you may have already played all your shots at this stage.
If you go by the record crowds at this tournament, they probably deserve more money.