Actually you get a lot of time in the water, on my first and only time there. I went for the one hour one, I had to get to class so I couldn't do more. The first time they make you start on a knee board to get hang of it. There were no lines and about 20 of us total, in one hour I think I got like 8 times on the rope and thats calculating for the change of boards and the walking back after every time I fell
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I was actually surprised at how much time I actually got on the water for one hour. The two hour one is much better because you can take a few break and catch your breath back.