I vote for 60 minutes. I LOVE CTX, but never do it as it is set up. I do a cardio w/ LL, another cardio w/ upper body split, etc.
I am a busy mom too, but I get up WAY early to get it done. The extra time can really "polish off" a good workout.
I love the yoga-type stretch ideas presented. I would definitely like to see a 20 minute stretch of this type added to one of the 60 minute videos. Especially with the DVD format, I think I would use that section once a week with any of your videos.