EU 6677 then CZ 8206 at Pudong
Chengdu → Shanghai → Shenzhen
Timetable, Shanghai time
20:00EU 6677 from Chengdu at the gate
19:45CZ 8206 to Shenzhen leaves the gate
23 h 45 apart on the timetable, overnight
CZ 8206 leaves 23 h 45 after EU 6677 arrives on the timetable: more than half a day, so not a connection we count.