I never work out later than noon time, I usually start anywhere from 8AM to Noon, I think its better to do it early.
Also, I currently work out once or twice a week, its smarter. Once a week I'll be there for a little over 2 hours doing High Intensity and then I might go again for 1 hour to do some running and a few machines. You gotta give yourself plenty of rest, it all depends on what you are shooting for, I'm trying to bulk up and its working, don't forget your protein and get tons of sleep.