The best fake tan that lasts the longest is the Bondi Sands Self Tanning Foam. This formula is designed to be easy to apply, has a natural-looking tan that develops over several hours, and lasts up to 7 days. It is also enriched with Aloe Vera, Vitamin E, and Coconut Oil, which helps to keep skin hydrated and nourished. Additionally, this formula is also vegan, cruelty-free, and free of parabens.