when i'm in the mood generally. theres nothing worst than forcing yourself to make a beat when the feeling is not there. I normally use that time to either chop samples, write, or watch tutorials for new techniques.
I don't get out of bed till noon. Work on music from 5 till when i start drinking and smoking with my boys, then I go to the club, bar or strip club most nights till 2-3, then we come back and work till 5-6 on what I did before we went out.
Mostly whenever I want, but if I have a project on hand I try to get those done as soon as possible. Most of time it's late at night, that's when i'm most creative. Something about the sunlight... Just not creative when it's shinning