2 hours as the company was desperately looking for a PM. The interview duration was of 40 mins and was relatively difficult. The person taking the interview was not open to hear the answers rather he already made up his mind and was sticking to it. As I said it was an interview and not a discussion mode. At the end I made a few queries about the role and job related basic stuffs and understood clearly, the interviewer didnt like 1 % of me asking.