BA 349 then LX 357 at Heathrow
Nice → London → Geneva
Timetable, London time
21:05BA 349 from Nice at the gate
19:30LX 357 to Geneva leaves the gate
22 h 25 apart on the timetable, overnight
LX 357 leaves 22 h 25 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.