How often you replace your overgrip is really down to personal preference. Those who like a really grippy surface may find that after two or three full matches the tackiness of their grip has waned and may want to replace. Others are prepared to wait until the grip has started to fray at the edges. Obviously it will also depend on how often you play, how much your hands sweat and what type of overgrip you use. Most of the thicker grips on our list tend to last a little bit longer. It could be that you really just like the fresh feel of a new grip or even the routine of re-strapping it in which case you may like to replace it every match. Fortunately most grips are fairly cheap (especially if you buy them in bulk) so you can go with what works best for you.