Six years. According to official website's inquiry of Fuzhou Education Bureau, President Dong has been the principal of Changle No.1 Middle School in Fujian Province since 20 17, and has served for six years as of August 24, 2023, so he has served for six years. Dong, male, party member of the Communist Party of China, is currently the principal and secretary of the General Party Branch of Changle No.1 Middle School in Fujian Province.