I was searching for Chelsy Sun and found this movie called Gyno Examination - Suzan. The peeing starts at 22:45.
Her name is (or the name she uses in the porno industry) Chelsy Sun. I have seen her on VIPissy and other sites. In this scene she does about 50 seconds but I have seen her go for over 2 minutes on VIPissy. Her stats are height 172 cm and weight 50kg.
I cut just the peeing bit from the full movie (see below) to make it easier to watch/download if you want.
Love the comment from the creepy doctor near the end of this clip!