sledhead,
The workouts are anywhere from 38 min. to 42 min. in the first month but half way through, he throws in an extra workout onto the end of the Pure Cardio workout (probably the hardest workout) that pushes total time close to 1 hr. He adds Cardio Abs to the Pure Cardio workout. PC is so hard because after the extended warm-up and 5-6 min. stretch, it is 16 or so minutes of NON-STOP cardio, no breaks whatsoever, and they are difficult moves. My heart is at 90% of my MHR for the last 1/2 of the PC workout.
Lots of calories got burned on those days!
Almost all the workouts in month one (other than PC), had a long warm-up (which is difficult in its own right), a long stretch, then 3 interval circuits with a short 30 sec. break b/w circuits. From what I have read, the Max Interval circuits add another circuit and the exercises in each circuit are longer so most workouts get pushed to close to an hr each. Most of the reviews I read on Insanity, some people were disappointed at first in the first month wt. loss but they ended up getting great results after the second month.
There are two more Insanity workouts out there too:
Insanity; The Asylum and Insanity: The Asylum #2. Depending on how we do this month, the wife and I may look into getting them. There are only 30 day programs and more sports based but WAY more difficult, from what I read. The moves are much more technical and you need to use an agility ladder and some other equipment with them.