9C 6726 then CZ 3871 at Guangzhou
Ningbo → Guangzhou → Nanjing
Timetable, Guangzhou time
22:159C 6726 from Ningbo at the gate
21:10CZ 3871 to Nanjing leaves the gate
22 h 55 apart on the timetable, overnight
CZ 3871 leaves 22 h 55 after 9C 6726 arrives on the timetable: more than half a day, so not a connection we count.