FM 812 then EU 6678 at Pudong
Hong Kong → Shanghai → Chengdu
Timetable, Shanghai time
16:15FM 812 from Hong Kong at the gate
12:55EU 6678 to Chengdu leaves the gate
20 h 40 apart on the timetable, overnight
EU 6678 leaves 20 h 40 after FM 812 arrives on the timetable: more than half a day, so not a connection we count.