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Actually, I was reading something a few months ago about the protection factor of sunscreen. Because sunscreen mainly "blocks", double-applying an 8 spf is the same, roughly, as using a 16 spf. I know that doesn't resolve the duration factor, but it's something to keep in mind.
I'm guessing melanoma? I have to deal with something different, so I don't know the ins and outs of the Big M, but I did want someone to reply to your message, if only me. 
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