The workouts on the Rev! and Peak! DVDs around 20 minutes if you include the warm-up and cool-down. Each DVD has three 15 minute workouts, 3 warm-ups and 3 cool-downs. The warm-ups and cool-downs are the same on both DVDs. Barefoot Abs is 15 minutes and Firm+Cardio Upper Body and Lower Body are each 30 minutes.
I ordered on 8/20 (I'm in South Carolina) and I haven't received mine yet. Hopefully it will arrive tomorrow before I leave for the airport. I'm out of town on business all week so I won't be able to try mine out until Thurs.