I guess I took it a different way. My interpretation was basically... once you get to a certain point in your life, the amount of time required for your respons

I guess I took it a different way. My interpretation was basically... once you get to a certain point in your life, the amount of time required for your responsibilities is significantly higher than it was in your youth. Four hours per day is probably achievable for the average college student but incredibly unlikely for the average "adult", for lack of a better term.