Okay, my male friend is a bodybuilder. He is about 200lb and 6ft tall, with a reasonable level of muscular definition.
He trains in the gym with weights 5x per week, doing a body part split. He is in the gym for about an hour and a half to two hours on average per night. We were discussing ideas one day and he said to me that he gets so tired by the time of his last workout of the week that he can barely finish it. I suggested cutting his sessions down to 3 or 4 times per week, but he wouldn't have it. He said that, because he is a diabetic (type 1) he needs to work much harder than the average person to force his body to gain muscle.