They are tough, but that is what I love about them. They are 60 min workouts. I have the cardio conditioning and the pure strength and burn. I think they also have a 20 min blast workout on the DVD as well, but I have never done them.
Not sure where you found them, but his website mytrainerbob.com usually has them on a discount price. Last I looked they were $3.99 each.
He also has one that is called beginner workout that is only 45 min long. I would say it's more intermediate level.