AI 2492 then SG 622 at Mumbai
Lucknow → Mumbai → Varanasi
Timetable, Mumbai time
16:30AI 2492 from Lucknow at the gate
10:40SG 622 to Varanasi leaves the gate
18 h 10 apart on the timetable, overnight
SG 622 leaves 18 h 10 after AI 2492 arrives on the timetable: more than half a day, so not a connection we count.