AI 3318 then 6E 136 at Mumbai
Patna → Mumbai → Chennai
Timetable, Mumbai time
11:15AI 3318 from Patna at the gate
04:156E 136 to Chennai leaves the gate
17 h apart on the timetable, overnight
6E 136 leaves 17 h after AI 3318 arrives on the timetable: more than half a day, so not a connection we count.