For health and weight maintenance, I would suggest three short cardio workouts per week, about 20 to 30 minutes per session. (womenshealthandfitness.com.au)
In Phase 2, you'll only have 3 days of strength training and one shorter cardio day. (shop.thebettyrocker.com)
In each round you will do three short cardio drills back to back and then repeat them (so it's six cardio bursts per round). (cathe.com)