I'd say you should train about 45 minutes per day at home, if you're not going to your dojo on those days, and train 2-3 times a week at your dojo for 2 hours each time. When you train at your dojo, be sure to be very observant of your classmates and try to remember what you learned and what you need to improve on. Then, when you're training at home, do some stretches first, then practice the things that you need to improve on, and even some tactics that you saw your classmates use.