Assuming an adult with a body weight of 60 kg (2.2 lb/kg), urine production should be at least 60 ml/hour, it should be at least 1.5 liters/day, preferably more. A high level of urine output per day is 2.5 liters. 2. stools (about 60-80% of stools is water and 80-99% in diarrhea).ormal urine volume ranges from 1.5 to 2.5 liters per day. Obviously, if you are sweating a lot, you need to drink at least 4 liters per day. If not, you need to drink at least 2 liters per day. Let me put the volume in American terms of quarts and gallons.