How many times do I work my assigned scene?

Most instructors will have you do your scene twice and maybe even 3 or 4 times. Just depends onthe instructor. Regarding rehearsing the scene, I would suggest to keep the scene work on you at all times and work it daily until it becomes a part of you. Of course you can give yourself one day off! However, continue to explore deeply and you might be surprised as to what may surface ...