6E 1385 then PG 223 at Bangkok
Chennai → Bangkok → Chiang Mai
Timetable, Bangkok time
10:306E 1385 from Chennai at the gate
10:00PG 223 to Chiang Mai leaves the gate
23 h 30 apart on the timetable, overnight
PG 223 leaves 23 h 30 after 6E 1385 arrives on the timetable: more than half a day, so not a connection we count.