Got yall beat, I had to retake the test this past month. But I could not go enough during the test. Well, once you start you have to finish, you can not leave is what they told me. I had to go fly in 35 min, I was lucky to get out of there and make my flight. They would not let me go, held my license till the faa lady said it was ok that I could reschedule. After review of why I did not give enough, I ran a marathon the day before and I only filled the cup up 1/3 not the 1/2 they needed. Thats a big cup!!
So, in short, drink lots of water, and be really to stay if you do not go enough.