Long time: We figure 20-30 minutes of "full body" - read bikini or "birthday suit" exposure for adequate skin conversion in the central il mid summer sun. If only a small portion of skin is exposed it will take quite a while. I would suggest adding in a vit d3 supplement to augment the sun and keep your measured level above 50 for all the health benefits vit d provides!
Answered 11/13/2013
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