SG 173 then SG 622 at Mumbai
Calicut → Mumbai → Varanasi
Timetable, Mumbai time
12:10SG 173 from Calicut at the gate
10:40SG 622 to Varanasi leaves the gate
22 h 30 apart on the timetable, overnight
SG 622 leaves 22 h 30 after SG 173 arrives on the timetable: more than half a day, so not a connection we count.