Some will tell you 10-14 days, but that's pretty unrealistic. Most people if they do what they're supposed to do, get sprayed once, then go back in 2-3 days for an additional session. Often, it takes two to get a nice base. After that, it's usually once a week to maintain. But it depends upon a lot of things - your skin, the shower gel you use, the lotion you use, your lifestyle (how much wear & tear is placed on the skin), how you exfoliate, etc.