Re: How long before a suntan goes away for a light skin person???
If you stayed inside for a month, then you would probably notice it completely gone because as many know, a new layer of skin is exposed every month. However, most of us, even after getting a good tan still go outside on a regular basis, and this exposure to the sun alone seems to keep the tan on for a bit longer. Where I live, summer takes place from december to january. I get a good tan in january, but as the winter months approach, I spend less time outside and the tan is usually mostly gone by the beginning of april. Also it depends a lot on what skin type you have.
There are six skin types recognised by dermatologists. Skin types 1-3 are what caucasion people fall under. Skin types 4-6 are skin that is naturally olive through to very black skin.
If you are skin type one, you would typically have blue eyes and pale skin which does not tan at all and burns very easily. Type two does not tan very easily, and over exposure all at once leads to burning, not tanning. You need to gradualy build up 'layers'. Skin type 3 burns first, but then tans after the initial burn (usually within 2 days you are tanned rather that red.)
I happen to have skin type 3 for reference.