KR 721 then TG 409 at Bangkok
Siem Reap → Bangkok → Singapore
Timetable, Bangkok time
17:05KR 721 from Siem Reap at the gate
16:35TG 409 to Singapore leaves the gate
23 h 30 apart on the timetable, overnight
TG 409 leaves 23 h 30 after KR 721 arrives on the timetable: more than half a day, so not a connection we count.