BA 353 then BA 594 at Heathrow
Nice → London → Venezia
Timetable, London time
08:45BA 353 from Nice at the gate
08:05BA 594 to Venezia leaves the gate
23 h 20 apart on the timetable, overnight
BA 594 leaves 23 h 20 after BA 353 arrives on the timetable: more than half a day, so not a connection we count.