a week and a half, there is not enough UV from sun there in Alaska , here in equatorial sun, 3 hrs of sun would turn it pig pink tan all around, however after that annoying naked skintone phase , it gets much slower and harder to see result from sun tanning alone. then it needs perhaps light oiling or water to get into next step of tan into honey tan and then it might require another oiling and sun tanning again into caramel tan.