9C 6726 then CZ 5301 at Guangzhou
Ningbo → Guangzhou → Harbin
Timetable, Guangzhou time
22:159C 6726 from Ningbo at the gate
18:55CZ 5301 to Harbin leaves the gate
20 h 40 apart on the timetable, overnight
CZ 5301 leaves 20 h 40 after 9C 6726 arrives on the timetable: more than half a day, so not a connection we count.