How much urine should an 11 year old boy produce daily?

It depends on a lot of things. How much you drink, sweat, bleed, if you eat foods with high water content. You are supposed to be taking in 1.5 Liters of water a day assuming you are getting 1 hour of exercise a day. Therefore you should probably urinate about 1.2 Liters a day, due to water loss from sweat.