B3 700 then TG 407 at Bangkok
Kolkata → Bangkok → Singapore
Timetable, Bangkok time
16:05B3 700 from Kolkata at the gate
14:40TG 407 to Singapore leaves the gate
22 h 35 apart on the timetable, overnight
TG 407 leaves 22 h 35 after B3 700 arrives on the timetable: more than half a day, so not a connection we count.