I had an interview last cycle and the whole interview day lasted until 3PM. It may seem long but I thought it was very organized and comforting except for the financial aid session, which I thought was rather unhelpful. Laura will probably be the first person you meet and she will flat out tell you the interview is suppose to be relaxing and rather "conversational" to see what kind of person you are. You'll also meet Dr. Stoute who is the chairman of something and go through the slides about the school very quickly, but spend majority of the time with Q&A and his background. The admissions committee and students seemed to get along very well and were very friendly. Be prepared for a little walk during the tour because you'll tour the building and SLC building which is across the street.