It's pretty random. I've gotten emails and calls from early in the morning to late in the evening (at the gym in my case). Also, some schools sent out interviews immediately after deadlines in December, it shocked me how fast they were. Other schools like NYU take their time and I probably won't hear form them until February, so there really is no pattern. Personally, I like the surprise. My strategy is to forget that I even applied and be surprised (whether positive or negative) when the results come in. Helps time go by faster.
