There is no rule to how often you SHOULD take a break. This will vary indiviually.An estimate could be when you feel you need it. But if you do it often and you stay away for a long time, you will have troubles getting nto things. One thing that note is that you can reduce your daily “blender time” if you feel weary. It is more eficient to learn on a daily basis than taking a marathon when you have time.