To truly get any meaningful results one needs to dry fast at least 5 days, but to heal a pathology you have to dry fast for 8 - 11 according to Dr. Filonov, a Russian medical doctor who has been researching and administering dry fasting for over 20 years. I have done 5 days and 9.5 days and the difference is night and day. Getting ready for my 11 day dry fast.