7 pm - 9 pm (or later if you held out of over 3 hours outside)
Alright, back to drinking 500 ml for you. For now we are going to prepare for the final desperation. If you held on for more than 2 hours, you might want to up this to 600 ml.
You have to pee 4 times per hour again, but go into the container. Picked something with a small opening? If you miss a lot, you can add water to fill it up to 1 liter if it still hasn't reached that by the end.