Well, I don't know if my advice will be that good or not since I'm not at my pre-pregnancy weight or shape yet (10 months post-partum) BUT I used the CTX series a good bit in the weeks after delivery because I just didn't have a lot of time (worked out during naps) and found that by splitting the tapes into cardio/weights and doing as much of the tape as I could when I could squeeze it in that I generally got 45 minutes of exercise in per day.
I could usually get through the cardio portion before the baby woke up, and then I'd do the strength portion and the abs during the next short nap.
Good for you for getting your husband to agree ahead of time to watch the kids so you can do your thing. I didn't do that, and ended up having the baby in his little bouncy seat napping in the room with me while I exercised. Sometimes he woke up, and the results were not always positive. He did giggle for the first time while I was doing Firm Vol 4 though, when Kai said "And releeeeeeeease."