When should I urinate? How frequently should I expect to urinate?

When you need to... Adult bladders hold about 400-600 milliliter of urine (about 1.5 - 2.5 cans of soda). You should pee when you feel the urge, which is usually every 2-4 hours. However, the frequency depends upon how much fluid you take in or what you are drinking (coffee, soda). If you are going rarely, more frequently (every hour or so) or with significant urgency consider seeing your doctor.