I believe the first Tae-Bo workout I did was one I rented from Netflix--Tae-bo Cardio Circuit 1. It was about a 50-55 minute workout as I recall and REALLY tough. I couldn't keep up with the whole thing but did most. Then I found another one called just Tae-bo: Cardio. That one is more lik 40-45 minutes and a bit less intense. I have been able to get through that from the day I bought it, but it still sometimes feel like I'm going to die before the workout is over and am always SOOOO glad to hear the music slowdown and the cooldown start. Gives me such a proud sense of achievement every time that I made it through.
I can't imagine doing Tae-bo more than once a week, personally. Then again, I am 53 and my knees aren't in the best shape anymore. All that squatting and kicking is rough on the knees for someone like me. I do love kickboxing though, and probably do 1 and sometimes 2 kickboxing workouts a week--but I tend to do ones that are less intense than Tae-bo.