Really when I find myself lacking time to really sit down and practice, I make sure that I’ve got at least 10 minutes to play a day. Anyone can find a spare 10 minutes on just about any given day and the most important thing about those 10 minutes is this: Play something you enjoy, and play something that challenges you. They can be one in the same. but if you only utilize those 10 minutes for a boring exercise, you could become bored with your practice time and come to dread it.