Was 30 minutes. We went to a waiting room about 10 minutes before the interviews. Around the waiting room were ~10 small conference rooms. The adcom people came out to call us into a specific conference room where the interview would be conducted. One adcom member asked all the questions while the other observed. The adcom member who asked the questions had clearly read my application in depth. The questions focused on my current work experiences, since I work at a nonprofit so it is less typical (e.g., Biggest impact I have had at work. How I chose to work there. How I made XYZ decision at work.) They also asked at the end “anything else we should know?” There was no time to ask them questions about HBS.
I then went to lunch where there was a panel of current students and then went on a campus tour.
