I know this info from a previous infomercial package that was put together with another company.
Most infomercial products are geared towards the "general public" and not necessarily the advanced exerciser. They are trying to make it marketable towards the non-exercising crowd. So...45 mins may be appealing to them and 60 mins is more intimidating. That's the beef I have with buying infomercial products. They are usually toned down and shorter to just get people moving. And then when they do non-infomercial products they *MAY* be a tad longer or a tad more difficult. But, usually with infomercial products they are shorter.
This is why I value Cathe products so much. They don't hit the airwaves as infomercial products! SNM puts out high quality 60+ min workouts and Cathe makes you feel like you were run over by a steam roller! That is what I need in a workout!!!!!
Just my opinion...