Our powder sunscreens were made especially for face, neck, arms and hands. With daily use on these areas, your brush or refill should last 2 ½ to 3 months. If you are reapplying throughout the day, it will last a shorter period of time. The powder may also be used on tops of feet, back of neck--any place that needs quick and easy sun protection. We don’t recommend powders for the whole body, because it would take a long time to apply enough coverage, and you would need refills often.