I stop after 5. Ive gone to 6. Ive got a propensity toward ingrowns and i dont get ingrowns with my de shaving but i dont want to push my luck with dull blades. Like all blades I can feel that the blade is less sharp, harder to shave as it gets more used. So after 5 i throw it out. GSB on Amazon are under 20cents a blade so Im satisfied tossing it after 5.