I think doing it 7 days a week can be beneficial, just don't be inflexible. If you feel no fatigue, don't take the day off. But it you start to have pain, take the damn day off! And even if you do it everyday, take an extended break after many months of Penis Enlargementing, that seems to recharge one's gains.
I'm with Gandolf and Omul_Paianjen. If you think you can handle 7-0, try it and track your gains. If you are not satisfied, go to 5-2, but understand it will take a few weeks to get meaningful feedback.