The post which best sums the thread up:
The whole idea that workouts have to be an hour or less (I've seen 40 minutes) seems to come from the assertion by Ivan Abadjaeve that testosterone drops in that time period... I've seen little in US research on the topic to supoprt the idea. The small acute hormonal effects seen during training (either direction) are probably pretty irrelevant which is what Shaf is getting at...sort of... The cortisol issue can more than be dealt with by sipping a carb and/or carb/protein drink throughout training.
Train until your finished.