BA 349 then BA 546 at Heathrow
Nice → London → Bologna
Timetable, London time
21:05BA 349 from Nice at the gate
20:25BA 546 to Bologna leaves the gate
23 h 20 apart on the timetable, overnight
BA 546 leaves 23 h 20 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.