More than 3 hours. According to inquiries at the Zigong Passenger Transport Center, we learned that taking the Dujiangyan bus from Zigong requires a stop on the way, which takes about ten minutes. It takes more than three hours to get there by taking the Dujiangyan bus from Zigong. Zigong has a history of two thousand years of salt industry and 70 years of city establishment. In 1939, the National Government approved the establishment of Zigong City, which is one of the earliest provincial cities and industrial towns in Sichuan Province.