OD 804 then OD 638 at Kuala Lumpur
Singapore → Kuala Lumpur → Dunhuang
Timetable, Kuala Lumpur time
15:10OD 804 from Singapore at the gate
14:40OD 638 to Dunhuang leaves the gate
23 h 30 apart on the timetable, overnight
OD 638 leaves 23 h 30 after OD 804 arrives on the timetable: more than half a day, so not a connection we count.