There’s no strict schedule, it’s all about feel. If your feet are slipping during a bottom turn or pop-up, that’s nature’s way of saying “more wax, dude!“ A fresh topcoat every few surfs keeps it grippy. Also, give it a full scrape and re-do when the old wax gets dirty, thick, or melts into a funky mess. Listen to your board and your feet—they’ll tell you when it’s time.