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You can drink a lot of water before 4pm - more than enough to reach your daily quota.

No, thanks, I prefer to stay hydrated as long as possible. People who advise to don’t drink water for 16 hours will be ignored at least.

I do agree that this sounds like horrible advice to give and one that most doctors would definitely advise against.

Where are you getting 16 hours from? He doesn't say when he wakes up, presumably around 5-6 a.m., which puts him at around 12 hours.