In regards to the calories burned per workout, this number will vary from person to person since this is a rest based training approach.
Fitness levels vary and you may push harder than someone else doing the same workout. The most accurate approach would be to use a heart rate monitor to figure out your individual expenditure.
One Primer did this and the workout was between 250-280 calories, but remember, you’re also burning more fat calories for up to 48 hours after, too. (The “aftershock” effect.)
These are just a few examples of what others have done. It is best to experiment with what works best for you.