AI 2606 then AI 2491 at Mumbai
Trivandrum → Mumbai → Lucknow
Timetable, Mumbai time
11:55AI 2606 from Trivandrum at the gate
11:15AI 2491 to Lucknow leaves the gate
23 h 20 apart on the timetable, overnight
AI 2491 leaves 23 h 20 after AI 2606 arrives on the timetable: more than half a day, so not a connection we count.