BA 349 then BA 740 at Heathrow
Nice → London → Geneva
Timetable, London time
21:05BA 349 from Nice at the gate
14:05BA 740 to Geneva leaves the gate
17 h apart on the timetable, overnight
BA 740 leaves 17 h after BA 349 arrives on the timetable: more than half a day, so not a connection we count.