Welcome to FitDay and the forums!
I don't think there is an "average" number anyone could give you. Calorie burn is dependent upon so many variables such as sex, muscle mass, age, weight, type of exercise, intensity of the workout, etc.
I think I would look through the exercises offered in Activities and just pick the one closest to the video you are doing (probably one of the cardio choices) and choose the appropriate time and intensity level. If you're doing weights, choose one of the weight lifting options.
Hope this helps!
47 M 5'8"
May 4, 2010...... 440? lbs. (Start FitDay Size 60 Jeans)
June 19, 2010.... 393 lbs. (First Weigh-in)
June 19, 2011.... 229 lbs. (164 lbs. gone in one year :-)
Current Weight... 185 lbs. (Size 36 Jeans)
Next Goal 169 lbs. (07/04/12)
Ultimate Goal 165 lbs. (12/31/12)
The best exercises for weight loss are Fork Putdowns and Table Pushaways.