BA 975 then BA 746 at Heathrow
Berlin → London → Geneva
Timetable, London time
13:05BA 975 from Berlin at the gate
10:30BA 746 to Geneva leaves the gate
21 h 25 apart on the timetable, overnight
BA 746 leaves 21 h 25 after BA 975 arrives on the timetable: more than half a day, so not a connection we count.