AI 2772 then SG 622 at Mumbai
Kolkata → Mumbai → Varanasi
Timetable, Mumbai time
13:25AI 2772 from Kolkata at the gate
10:40SG 622 to Varanasi leaves the gate
21 h 15 apart on the timetable, overnight
SG 622 leaves 21 h 15 after AI 2772 arrives on the timetable: more than half a day, so not a connection we count.