The time it takes to tan varies depending on several factors such as your skin type, the intensity of the sun's rays, and the use of tanning products. Generally, it can take anywhere from 20 minutes to a few hours of sun exposure to start developing a tan. However, it's essential to tan safely to avoid skin damage and burns. Gradually build up your sun exposure time, use sunscreen, and take breaks in the shade to protect your skin while still achieving a healthy tan. Remember that everyone's skin is different, so the time it takes to tan will vary from person to person.