CZ 6783 then CZ 8253 at Guangzhou
Haikou → Guangzhou → Wanxian
Timetable, Guangzhou time
19:30CZ 6783 from Haikou at the gate
18:00CZ 8253 to Wanxian leaves the gate
22 h 30 apart on the timetable, overnight
CZ 8253 leaves 22 h 30 after CZ 6783 arrives on the timetable: more than half a day, so not a connection we count.