10-30 minutes. According to information from the 39 Health Network, the disease elimination reaction occurs in the early stages of practicing the Flat Swing Gong. Practitioners will experience five feelings such as soreness, pain, numbness, itching, and swelling. These five feelings are called the "five senses" and are the key to detoxification. It is a normal phenomenon that the disease elimination reaction will occur in 10-30 minutes.