You’re about an hour and a half into the movie and, boy, are you regretting that large soda. You can hold it... but should you?<br /><br />Peeing is pretty important. Your kidneys filter excess water and waste out of your blood and that urine needs somewhere to go: your bladder. Normally, it’ll hold 1-2 cups comfortably. But if you make a habit of holding your pee for long periods of time, you can actually stretch your bladder to easily hold even more.