OD 1633 then OD 638 at Kuala Lumpur
Kuching → Kuala Lumpur → Dunhuang
Timetable, Kuala Lumpur time
15:00OD 1633 from Kuching at the gate
14:40OD 638 to Dunhuang leaves the gate
23 h 40 apart on the timetable, overnight
OD 638 leaves 23 h 40 after OD 1633 arrives on the timetable: more than half a day, so not a connection we count.