The cortisol timeframe is fine and dandy, but who in their right mind wants to stay at the gym any longer than an hour or hour and a half at the time? If your spending three hours then what kind of life is that?

24 hours in a day
8 hours work, add an hour to get ready for work in the morning 9 hours
3 hours in the gym
8 hours of sleep

that leaves you with 4 hours a day? If there is any extra benefits for staying at the gym longer are the benefits that much greater than someone who only trains an 1 1/2 hours and is it worth not having a life because of the benefits?