It depends on the person. My skin is dark German. It takes me about 45 minutes to an hour in UV 3 to burn, depending on how far into the summer it is. Right now, as I am stil light from the winter, it doesn't take long to burn...maybe 20 minutes out of the water, 45 minutes in a pool, and an hour in the Pacific. I always put oil free SPF 30 on my face and arms during the day, or all over when I swim or run without my shirt. I've never 'tanned' per say, but I've had plenty of sun exposure in my life. Admitedly, I've never experiented with how long a tan lasts.
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