Two years. Nanning Dongfeng Beiyuan has a large amount of work, which will take two years to complete. Nanning, referred to as Tancheng for short, also known as Greentown and Tancheng, is a prefecture-level city, provincial capital, I-type big city and the core city of Beibu Gulf urban agglomeration under the jurisdiction of Guangxi Zhuang Autonomous Region. It is also the central city of Beibu Gulf Economic Zone approved by the State Council, and a comprehensive transportation hub connecting the southwest to the sea.