BA 591 then VS 358 at Heathrow
Venezia → London → Mumbai
Timetable, London time
13:10BA 591 from Venezia at the gate
12:25VS 358 to Mumbai leaves the gate
23 h 15 apart on the timetable, overnight
VS 358 leaves 23 h 15 after BA 591 arrives on the timetable: more than half a day, so not a connection we count.