SG 9555 then SG 622 at Mumbai
Gorakhpur → Mumbai → Varanasi
Timetable, Mumbai time
15:05SG 9555 from Gorakhpur at the gate
10:40SG 622 to Varanasi leaves the gate
19 h 35 apart on the timetable, overnight
SG 622 leaves 19 h 35 after SG 9555 arrives on the timetable: more than half a day, so not a connection we count.