SG 621 then AI 3205 at Mumbai
Udaipur → Mumbai → Lucknow
Timetable, Mumbai time
20:45SG 621 from Udaipur at the gate
15:20AI 3205 to Lucknow leaves the gate
18 h 35 apart on the timetable, overnight
AI 3205 leaves 18 h 35 after SG 621 arrives on the timetable: more than half a day, so not a connection we count.