VN 524 then EU 6678 at Pudong
Ho Chi Minh City → Shanghai → Chengdu
Timetable, Shanghai time
14:15VN 524 from Ho Chi Minh City at the gate
12:55EU 6678 to Chengdu leaves the gate
22 h 40 apart on the timetable, overnight
EU 6678 leaves 22 h 40 after VN 524 arrives on the timetable: more than half a day, so not a connection we count.