Hello all! This is my first time posting! I received my invitation for interview by the department on November 9th, was accepted by the department on November 13th, and found out last Thursday that I am a finalist for Gates Cambridge with the physical sciences panel! I never expected to be considered and just started doing research over the weekend and from what I found, it looks that in normal years there was just a weekend of interviews - a Saturday and Sunday - one set in Seattle at the Gates Foundation and one set at Cambridge plus maybe some skype interviews aside. Assuming the days were max 9 hours of interviews, with 2 interviews/hour since each was 20-25 min, that would mean around ~80 interviews total for ~30ish places. At least that's my uninformed guess based on information from past years.