30 days?
I don't think it is an accident. We have adjusted to a lunar cycle. Why are women's cycles not 10 days?
Personally I think 30 is important, because you should experience enough challenges to know whether you can continue it or not.
Your initial post contains the single strongest reason I can find against 10 days:
"Plus, friends and family would probably make more allowances for just a 10 day challenge."
Allowances? They don't need to make allowances, they need to have acceptance. This isn't for "fun", it's a serious change! :-) As you say, 10 days people can "put up with" your changes... it's not a realistic experiment. 30 days, if people feel strongly about it, they won't put up with it that long.
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