People who want to lose 15 pounds or less will need 20 days of HCG treatment followed by 3 extra days of the low calorie meal plan. People who need to lose more than 15 pounds will need 40 HCG treatments followed by 3 extra days of the low calorie meal plan. If you still need to lose more weight, you need to wait 4 weeks and control your foods before starting a new HCG cycle. People become temporarily immune to the effects of HCG after 40 days of HCG treatment, skipping an injection once or twice a week helps prolong the HCG immunity factor. Skip the same day(s) each week!