BA 349 then BA 544 at Heathrow
Nice → London → Bologna
Timetable, London time
21:05BA 349 from Nice at the gate
14:00BA 544 to Bologna leaves the gate
16 h 55 apart on the timetable, overnight
BA 544 leaves 16 h 55 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.