6E 5275 then 6E 17 at Mumbai
Siliguri → Mumbai → Istanbul
Timetable, Mumbai time
13:106E 5275 from Siliguri at the gate
13:056E 17 to Istanbul leaves the gate
23 h 55 apart on the timetable, overnight
6E 17 leaves 23 h 55 after 6E 5275 arrives on the timetable: more than half a day, so not a connection we count.