You could run this several ways with those times. A 30 minute class could be run as Fast Blast Bootcamp. Applying HIIT principles/integrated body conditioning (cardio/strength application).
Or you could run the standard bootcamp for the 45 minutes.
And you could always hybrid the class with the 30 minute class ending with a stretch/stabiity round for 15 minutes.
The options are limitless. I wish success.