BA 373 then BA 750 at Heathrow
Toulouse → London → Geneva
Timetable, London time
18:00BA 373 from Toulouse at the gate
17:35BA 750 to Geneva leaves the gate
23 h 35 apart on the timetable, overnight
BA 750 leaves 23 h 35 after BA 373 arrives on the timetable: more than half a day, so not a connection we count.