I've done a day and a half but there's not really a good reason. Just dangerous.
Update: what do you mean? Are you saying "water fasting" is having nothing including water? Or is "water fasting" just fasting? If so, 10 days and it's not dangerous.
Water fasting means not eating or drinking anything except water.
And yeah, depending on how obese someone is, they can go for a month or longer.
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