I interviewed on Dec. 13th and the Director of Admissions told us that the usual amount of time to hear back after an interview is about 10 weeks. So for us mid-Dec. interviews, that puts us into end of Feb/beginning of March. Doesn't that stink?
She also told us that as soon as a letter goes out they update your status page, so you can keep checking that and where it says "Decision" will say when a letter goes out.