Because you drink faster than you pee. A gulp of water brings in up to 100 ml of water, depending on mouth size, and if you’re thirsty you might take a gulp every 2 seconds, maintaining a rate of ~50ml/sec.
Urination evacuates water at a rate of ~16ml/sec, with added volume from the salts and debris it’s flushing from your body. As such, you’re going to spend at least three times as long peeing out the water as you did drinking it
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