As long as you'd like! We've stuck some waterproof stickers to the mugs around the office, and they're still going strong, even after several years! If you're also looking for weatherproof stickers, this product is extremely versatile. They will hold up great stuck to windows, cars, and pretty much any flat outdoor surface you can imagine. Hand out your custom waterproof stickers at events like trade shows, networking parties, and conferences - people will love sticking them places where they can continue to raise brand awareness for years to come!