I just finished P90X-3. I've done 4+ rounds of the original P90X over the past cople of years.
X3 is a series of 30 minute workouts for 6 days a week (including the "stretch day") structured similar to the original P90X with a big emphasis (in my opinion) on core strength & balance. One day is cardio, the next is resistance, then cardio, etc.
If you're short on time, it does a nice job mixing things up. You can get a really good/tough workout done in the 30 minutes if you push yourself.
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