I find that there is really no set time period that I can get to hacking but I do have tendencies. If I get a light day at school I might go to my hideout at the library and get a few hours of work done. Other than that I tend to work pretty hard during the 6 PM to 2 AM range and most of my greatest breakthroughs always seem to be right after I have had a good night of sleep after being frustrated by a problem the night before.