UB 19 then TG 359 at Bangkok
Yangon → Bangkok → Chennai
Timetable, Bangkok time
16:20UB 19 from Yangon at the gate
13:30TG 359 to Chennai leaves the gate
21 h 10 apart on the timetable, overnight
TG 359 leaves 21 h 10 after UB 19 arrives on the timetable: more than half a day, so not a connection we count.