I practice between 4 and 7 hours. Depends on what I have to learan, or what sort of mood i'm in. Or whate time I wake up in the morning. I practice well late at night and very early. I don;t konow why that is though. I find if I spend morning learning new notes, and spend hours doing that, i can rest and let it all settle, the return later and really get the notes under my belt. I hate learning something, then going to bed, and waking up the next day, and spend 30 minutes covering ground you aready did the day before, whereas if I do it all in a day, I'm satisfied, and can stert where i left off the next day