The time it takes for the bladder to burst can vary significantly between individuals, but it's important to note that the bladder is quite resilient and generally does not burst under normal circumstances. Most people would feel a strong urge to urinate long before reaching a dangerous level of fullness.
If someone were to hold in urine for an extended period, typically beyond several hours (often cited as 6 to 8 hours), they might experience significant discomfort and potential health risks. In extreme cases, holding urine for excessive periods can lead to urinary retention and potential bladder damage, but an actual rupture is rare and would usually require an extreme situation, such as severe trauma or a medical condition.
If you or someone else is experiencing pain or discomfort or has concerns about bladder health, it's always best to consult a medical professional.