B3 700 then SQ 709 at Bangkok
Kolkata → Bangkok → Singapore
Timetable, Bangkok time
16:05B3 700 from Kolkata at the gate
15:45SQ 709 to Singapore leaves the gate
23 h 40 apart on the timetable, overnight
SQ 709 leaves 23 h 40 after B3 700 arrives on the timetable: more than half a day, so not a connection we count.