Insanity Workout: Plyometric Cardio Circuit

In the article posted at http://workout.finishwellfitness.com/insanity-workout/insanity-workout-plyometric-cardio-circuit the author said:

The Plyometric Cardio Circuit is designed to utilize Shaun T.’s idea of max interval training, in which instead of doing short intervals of activity followed by short rests, you do long intervals of max activity (and still short rests!). The workout itself is forty minutes long, but we suspect you’ll feel like you worked out for well over an hour when you’re done!

The workout is awesome but it felt like I worked out for two hours, not one.