The only thing matters is what kind of workout you are doing. Yeah generally speaking, if you spend 60 minutes in the gym actually working out, most likely that should be pretty good. However, it all depends on what you are doing. I use to do cardio one day, weight lifting the other, MMA style exercises (Burpees, etc) the third and I finished off each workout with a 20 - 30 minute run. It took me an hour at most. Anything more then that would be overkill and unnecessary unless you are a pro bodybuilder. I'm not so I can't comment on that.