Here is my schedule. 30 minutes is my minimum.
Sunday - Just crunches
Monday - 30 minutes of DDR2 and crunches
Tuesday - 30 minutes of Kinect Adventures and crunches
Wednesday - 30 minutes of Yoga
Thursday - 30 minutes of Kinect Sports and crunches
Friday - 30 minutes of Dance Central and crunches
Saturday - Strength training and crunches
Crunches - 25 regular, 25 reverse, 25 left crunch twist, 25 right crunch twist, 25 bicycle, and 25 vertical leg.
Strength Training - Rowing squats, regular push ups, diamond push ups, wide arm push ups, lunges, side lunges, tricep extension, single leg twist (left and right), single leg extension (left and right), bicep curls, calf rise, and bent over row with dumbbell.