For example, how long would it take to make a photo realistic pic of a jet fighter with Max compared to Maya? How long is a piece of string? There are so many variables in that - I would suspect that if two people with equal experience and skill opened both packages and started modelling together they would probably finish around the same time. It depends on how good people are with the programme they know, how much experience they have, what you define as photorealistic etc etc etc etc. I don't think some packages make for genius work in record time automatically - there's the human factor to consider.