Man, I have a hard time going over an hour when just doing weights, and I agree that if you can go longer than that, it's just not intense enough. On chest day, after about 1/2 an hour, I can barely press just the bar. I alternate between HIT and kinda regular workouts, throwing in some form of cardio between the HIT and every 4 regular sets for 3 mins, then hit the next set, doing a total of 3 sets(i.e.Barbell press, dumbell press, dumbell flyes) then finishing with 10 mins. straight cardio.I also agree that it depends on the goal and experience. With that being said, it's certainly easy enough to tailor your workout to your specific goals. Obviously some supps will help with keeping some things in check whilst you workout. Bottom line is that I feel change is good and you can tailor your workout to your goals and needs.