There were 3 rounds of interviews for 3 different positions. It took about 2 hours all together, but all the interviews went about the same. I actually wasn't picked for any of the positions that I interviewed for which was pretty demoralizing at the time, but about a month later I received a call from the manager asking if I would be interested in a new position that was just opened up, and I said of course!
Make sure you are familiar with the STAR approach for answering the questions; they go over what it means during the interview but it helps to know beforehand.