BA 929 then BA 750 at Heathrow
Hannover → London → Geneva
Timetable, London time
19:00BA 929 from Hannover at the gate
17:35BA 750 to Geneva leaves the gate
22 h 35 apart on the timetable, overnight
BA 750 leaves 22 h 35 after BA 929 arrives on the timetable: more than half a day, so not a connection we count.