My experiment started one night in Korea, when the one bathroom my room mates and I shared was occupied. I just could not wait, so I grabbed an empty bottle of water I had in my room and relived myself.
The next morning I woke up and the bathroom was occupied yet again. I thought, "well, I haven't emptied this water bottle yet, so why not?"
It turned out that on this day I was just too lazy to leave my room, and so I ended up using the bottle many more times. Just 18 hours after my original usage of the bottle I stopped my experiment. The results speak for themselves:
There you have it, the answer to your question: The average DFM excretes 2 Litres of urine in a day (perhaps more). And less you think I loaded myself up with water for this experiment, just look at the colour of the bottle - I wasn't exactly hyper-hydrated. This is why it is recommended you drink 8 cups of water a day (2 Litres).