Im not really sure but Im thinking in the neighborhood of 1:30-:40. My time was 1:20 and he left about :10 or so seconds before. Thinking back on it I think what happened is he was not giving himself a long enough surface interval. I recall thinking to myself that he was giving himself less then three minutes on the surface where I normally wait around 3:30. In other words he was diving approximately six dives to my five dives, right? We're having dinner with him tonight so we will dig a bit further into his normal routines.