9C 6726 then CZ 3595 at Guangzhou
Ningbo → Guangzhou → Shanghai Hongqiao
Timetable, Guangzhou time
22:159C 6726 from Ningbo at the gate
20:00CZ 3595 to Shanghai Hongqiao leaves the gate
21 h 45 apart on the timetable, overnight
CZ 3595 leaves 21 h 45 after 9C 6726 arrives on the timetable: more than half a day, so not a connection we count.