9C 6726 then CZ 3439 at Guangzhou
Ningbo → Guangzhou → Chongqing
Timetable, Guangzhou time
22:159C 6726 from Ningbo at the gate
20:05CZ 3439 to Chongqing leaves the gate
21 h 50 apart on the timetable, overnight
CZ 3439 leaves 21 h 50 after 9C 6726 arrives on the timetable: more than half a day, so not a connection we count.