They tell you to check in at 8 am, but I don't think they really came and got everyone in the lobby until like 8:45 to 9ish.
From around 9 to 10:30 you have orientation with your interview group. First admissions, then student affairs, then financial aid then curriculum. You have a chance to ask questions after each presentation.
10:30-11:30 you have a tour with someone in the admissions office. The campus isn't big enough for an hour long tour, so if I recall correctly, there's a few minutes of dead time here and there, bathroom breaks, etc. We got to see a class in the new building, but we were really in there for maybe 3 or 4 minutes.
11:30-noon you get the OMM presentation. There will be some participation here if you are inclined to volunteer.
Noon to 1 they break you up into your groups of 3-4 and you have lunch with a second year student and get to ask questions.
Then 1 to 3 they do interviews. I think the interviews actually start at 1:30, but they bring you to the waiting area around 1. They give you 30 minutes to interview. Your interview time could be anywhere in that window, so you might have a couple of hours after lunch before your interview or you might be done by 2 pm.