300 hours. The training time of the first-class three pairs and the first-class three-tube wheel shall not be less than 450 hours. The training time for the first-class captain, first mate, first-class chief engineer, first-class tugboat, second-class driver and second-class engineer should be no less than 300 hours, the minimum training time for the second-class inland river chief engineer in Hangzhou, Zhejiang Province is 300 hours, and the training time for the second-class captain, second-class chief engineer, third-class driver and third-class engineer should be no less than 150 hours. The actual operation training time should be no less than one third of the total time.