No set hours, but I've been there at 11AM on a Sunday and it is practically dead. A handful of girls around, and they are almost all servicing punters who already had a prior appointment. Not a single one was available for walk-ins. I've gone around 11PM / midnight, and they place is still hopping with punters and WG. But by this time, you are probably the 10th or 15th or 20th customer for the girl that day, LOL!
One way to confirm this notion, she will be using LOTS of lubrication, haha!