BA 82 then BA 746 at Heathrow
Abuja → London → Geneva
Timetable, London time
14:20BA 82 from Abuja at the gate
10:30BA 746 to Geneva leaves the gate
20 h 10 apart on the timetable, overnight
BA 746 leaves 20 h 10 after BA 82 arrives on the timetable: more than half a day, so not a connection we count.