While stacking is possible, you do have to be careful as the side effects and risks may be greater. If stacking is recommended, consult with multiple board certified physicians to determine if stacking is in your best interests.
CoolSculpting is generally performed in "cycles" with each cycle taking an hour and covers one area. 60 minutes is required for the tissue to reach the correct temperature to cause the fat to shrink. Typically, separate cycles are needed for the upper and lower abdomen (each an hour), and each flank requires separate hour cycles. Two treatments can be done on the same day, and the time between treatments varies based on the areas treated.