The header text of The Simter workout says: '2 minutes rest between combos and sets'. If you make a 2' rest after each of the 30 combos it will take over one, boring, hour. I guess 2' after each set is sufficent.
Btw: The extra credit (use 8kg+ dumbells) is a bit harsh in a workout containing bent over lateral raises.
Upper Body Sculpt has the same EC.