CZ 3605 then CZ 3545 at Guangzhou
Yanji → Guangzhou → Shanghai Hongqiao
Timetable, Guangzhou time
18:55CZ 3605 from Yanji at the gate
17:00CZ 3545 to Shanghai Hongqiao leaves the gate
22 h 05 apart on the timetable, overnight
CZ 3545 leaves 22 h 05 after CZ 3605 arrives on the timetable: more than half a day, so not a connection we count.