Music like any other subject needs weekly time devoted to improve upon it. I recommend 20 minutes 4 times a week, or 30 minutes 3 times a week. This is the minimum amount of time I believe is needed to keep yourself improving on techniques we discuss in lessons.
It is also required for oboe and bassoon players to have a minimum of 2 good playing reeds at all times. This allows us to spend the majority of lesson times devoted to playing beautiful music.