CZ 3605 then 9C 6720 at Guangzhou
Yanji → Guangzhou → Shanghai Hongqiao
Timetable, Guangzhou time
18:55CZ 3605 from Yanji at the gate
16:359C 6720 to Shanghai Hongqiao leaves the gate
21 h 40 apart on the timetable, overnight
9C 6720 leaves 21 h 40 after CZ 3605 arrives on the timetable: more than half a day, so not a connection we count.