Here's what I figured out. Basically, once you interview, your file finally goes to the deciding committee and your interviewer must be there to speak on or against your behalf. After that, it takes literally a couple of days to get your decision. I learned this because I emailed my interviewer about something else besides my admissions and in the reply he also mentioned that my file was already reviewed like a week after I interviewed. Then a week later, I got my acceptances. My roommates took even less time, like only a week. Hope this helps, good luck to all.