Practice techniques?

Thanks to The bulletproof musician for their insightful post. I'm often asked how much you should practice, and this is in line with what I would suggest.

The only thing I would add is to space your practicing out. Some days you might want to practice more than 3 or 4 hours a day. Some days less. And you don't have to do it all in a row either; I tell my students that if they practice 15 minutes in the morning, and 15 minutes in the evening that counts*.

How much do you practice? And how do you divide the time?

*I would encourage anyone who practices, to practice more than 30 minutes and not in this fashion. This is really to encourage students to develop a routine.