BA 309 then BA 746 at Heathrow
Paris Charles de Gaulle → London → Geneva
Timetable, London time
16:00BA 309 from Paris Charles de Gaulle at the gate
10:30BA 746 to Geneva leaves the gate
18 h 30 apart on the timetable, overnight
BA 746 leaves 18 h 30 after BA 309 arrives on the timetable: more than half a day, so not a connection we count.