SG 621 then 6E 5354 at Mumbai
Udaipur → Mumbai → Kolkata
Timetable, Mumbai time
20:45SG 621 from Udaipur at the gate
15:156E 5354 to Kolkata leaves the gate
18 h 30 apart on the timetable, overnight
6E 5354 leaves 18 h 30 after SG 621 arrives on the timetable: more than half a day, so not a connection we count.