it's very variable. somepeople have theirs in the morning first and have that tour midday. After the tour, there's lunch and finaid, and then another group has the afternoon set of interviews. My interviewer took an hour, and people can be scheduled as late as 330 or so-- so you might not get out till 430.
you can probably call them and ask to be setup for the morning set of interviews if youwish.
i always think it's best to have your interviews first before the finaid tour and lunch-- so see if you can swing it.