AI 3318 then IX 2201 at Mumbai
Patna → Mumbai → Cochin
Timetable, Mumbai time
11:15AI 3318 from Patna at the gate
05:15IX 2201 to Cochin leaves the gate
18 h apart on the timetable, overnight
IX 2201 leaves 18 h after AI 3318 arrives on the timetable: more than half a day, so not a connection we count.