Isle of Paradise drops create a tan that lasts up to 5 days, with the color developing fully in 4 to 6 hours. The longevity can vary depending on your skin, how often you moisturize, and how frequently you reapply the drops. To maintain the glow for longer, it is best to reapply every few days and keep skin well-moisturized, especially if you take very hot showers or swim in chlorinated water.