CZ 8205 then EU 6668 at Pudong
Shenzhen → Shanghai → Chengdu
Timetable, Shanghai time
19:35CZ 8205 from Shenzhen at the gate
19:25EU 6668 to Chengdu leaves the gate
23 h 50 apart on the timetable, overnight
EU 6668 leaves 23 h 50 after CZ 8205 arrives on the timetable: more than half a day, so not a connection we count.