The Aquabug goes around in circles and back and forth until it cleans the entire pool.
Our pool is a 16 x 32 and it has been about 2 1/2 hours since I hooked it up and the pool is almost entirely clean. I still have to brush off the steps and a little algae off the wall so the bug can get that up as well.
I am so going to enjoy this summer not having to hand vacuum every few days. Now if I could just teach it to make a nice cold drink!