CZ 3868 then CZ 6778 at Guangzhou
LIJ → Guangzhou → Haikou
Timetable, Guangzhou time
20:50CZ 3868 from LIJ at the gate
16:30CZ 6778 to Haikou leaves the gate
19 h 40 apart on the timetable, overnight
CZ 6778 leaves 19 h 40 after CZ 3868 arrives on the timetable: more than half a day, so not a connection we count.