8K 801 then TG 321 at Bangkok
Singapore → Bangkok → Dhaka
Timetable, Bangkok time
22:198K 801 from Singapore at the gate
10:55TG 321 to Dhaka leaves the gate
12 h 36 apart on the timetable, overnight
TG 321 leaves 12 h 36 after 8K 801 arrives on the timetable: more than half a day, so not a connection we count.