Two years. According to Douban.com, the blacklisted KFC files will be cleared within two years, and Yum will no longer have any records. The brand after two years. KFC is one of the multinational chain restaurants in the United States, and the second largest fast food and the largest fried chicken chain enterprise in the world. Founded by the founder Harlan Sandoz on 1952, it mainly sells high-calorie fast food such as fried chicken, hamburgers, French fries, mixed rice, egg tarts and soda.