Whats the longest you haven't eaten anything?

[VAMatt]

Per the terms posed by the OP, my father used to go about 21 hours everyday. He ate dinner and an evening snack only. But, in reality he took in a bunch of nutrients every morning with his coffee loaded with cream and sugar.

If we really want to talk about fasting, we should be discussing time without consuming calories. If one gets calories via liquid, they're not fasting in a medical sense.