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I can often go 12-14 hours without a meal if I really need to, but the longest was probably about 36 hours.

I got food poisoned and couldn't hold anything down, not even water, would vomit a few minutes later.

Eventually I was able to slowly chew on ice cubes to be able to get some liquid down and then a few hours later I was able to start sipping Gatorade, but I didn't want to risk anything so I waited several more hours before trying any actual solid food (dry crackers).