It depends on wear. If you use a release and a string loop the string holds longer. I try to change mine every two years, but end up doing it every year. I think to myself, it gets damp and cold and everything else out there and used for lots of practice arrows and league, so before the season I try to change it, having a bow press helps, and let it get 'shot' in so to speak before season.

Yes maybe it seems weird to change every year, but if ever, and I say if the world class buck comes by, I would hate to miss a shot cause the string broke or something else! Cant put a price on that! [8D]