Y8 7520 then CZ 3549 at Pudong
Zhengzhou → Shanghai → Guangzhou
Timetable, Shanghai time
11:50Y8 7520 from Zhengzhou at the gate
06:55CZ 3549 to Guangzhou leaves the gate
19 h 05 apart on the timetable, overnight
CZ 3549 leaves 19 h 05 after Y8 7520 arrives on the timetable: more than half a day, so not a connection we count.