I have kidney problems, and one of the tests they do is a VCUG.
They cath me, and fill my bladder up as full as I can take it.
It starts to hurt at around 25 oz, but I always try to get to 30+, which is optimum to get a good test reading.
But as far as normal hold-age, mine is tiny. I've been trained to go as soon as I get the inkling that I miiight have to pee (cuz of my condition), so I go about 8+ times a day, but all very little.
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