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Your body doesn’t use up water turning it in to nothing. You are meant to pee out what isn’t lost to sweat.

Parent is correct. NHS sources say upto 7 times during the day is normal and "Every 3 to 4 hours is considered healthy. Going every 1 to 2 hours usually means you either have an overactive bladder or are drinking too much at once."

Saying every 30 minutes is normal is just the same as advocating drinking too much water

By that logic, if I drank the right amount of water with 100% accuracy for multiple days, I'd only have to pee every few days.

I’m not arguing that 100% of water consumed can be retained, just that peeing every 30 minutes means you have an unnecessarily large surplus. This is simply a truth.