It does not really matter how many times you do them, but how you are performing them. Obviously yes, a standard amount of more RC's than not is good, as to induce the habit of doing so. However, if you are not truly questioning your reality with every RC, well then the purpose is almost defeated. If you don't get into the habit of questioning your reality, and using a RC to give you an answer, then how will it play out in your dreams? Soon it could just become something you mindlessly do in your dreams out of habitual interest, not actually snapping you into lucidity. Ya know?