Two weeks. According to the official information of Nantong University, the major of mechanical and electronic engineering needs a two-week metalworking internship and internship report. Nantong University, referred to as "Tongda", is located in Nantong City, Jiangsu Province. The school is a comprehensive university jointly established by the People's Government of Jiangsu Province and the Ministry of Transport, and it is a Class B construction university under the high-level university construction peak plan of Jiangsu Province.