My dishwasher is brand new

Question

My dishwasher is brand new Model FDB1502RGS0. I used it for the first time today. It seemed to be cleaning for a very long time. It was up to 2 hours and I had to leave so I turned it off. How long should it take. That seems like an awfully long time. I kept waiting for the drying mode to start and it sounded like it kept filling up and emptying. Does this sound right?Please advise asap.