CZ 3264 then 9C 6720 at Guangzhou
Dazhou → Guangzhou → Shanghai Hongqiao
Timetable, Guangzhou time
23:15CZ 3264 from Dazhou at the gate
16:359C 6720 to Shanghai Hongqiao leaves the gate
17 h 20 apart on the timetable, overnight
9C 6720 leaves 17 h 20 after CZ 3264 arrives on the timetable: more than half a day, so not a connection we count.