A spray tan can last between five to seven days, and up to 10 days when maintained with a tan extender. Adequate preparation before spray tanning and proper maintenance afterwards help the tanning effect last longer.
To prepare the skin for a spray tanning session, thoroughly exfoliate with a scrub that does not contain oils and moisturizers. Avoid applying moisturizers anywhere the spray tan will be applied. Stop using any Retinol-A or Accutane products one week before the session; they affect how DHA, spray tan's active ingredient, is absorbed and can produce splotchy results.
After the spray tan session, take care to avoid water exposure for at least eight hours. This includes showers and long soaks in baths. In addition to this, avoid exfoliating for one week, minimize shaving as much as possible and moisturize liberally after every shower. Keeping skin well hydrated helps extend the life of the spray tan.