From six in the morning to eight at night. According to the query map, the subway network shows. Changchun Light Rail Line 4 departs from the subway station of Beikou Station of Changchun Station. The first bus to the depot subway station is at 06: 00 in the morning, the last bus is at 20: 00 in the evening, and the last bus will arrive at the subway station at 20: 00 at the latest. Starting from the depot subway station, the first bus to the Beikou subway station of Changchun Station is at 06: 00 in the morning, the last bus is at 20: 00 in the evening, and the last bus arrives at the Beikou subway station of Changchun Station at 20: 00 at the latest.