The Aisle cup holds one ounce (30 ml) of fluid. For reference, the entire average period is approx 1-2 ounces (30-60 ml). You can wear your Aisle Cup for up to 12 consecutive hours - including overnight - before removing, washing and reinserting. By monitoring the fullness of the cup, you'll learn how often to empty it according to your personal needs.
It's not necessary to remove your menstrual cup before urinating or having a bowel movement. Make sure that you urinate often and that you empty your bladder completely each time.