SG 621 then AI 2773 at Mumbai
Udaipur → Mumbai → Kolkata
Timetable, Mumbai time
20:45SG 621 from Udaipur at the gate
14:05AI 2773 to Kolkata leaves the gate
17 h 20 apart on the timetable, overnight
AI 2773 leaves 17 h 20 after SG 621 arrives on the timetable: more than half a day, so not a connection we count.