FB 851 then BA 732 at Heathrow
Sofia → London → Geneva
Timetable, London time
12:10FB 851 from Sofia at the gate
10:45BA 732 to Geneva leaves the gate
22 h 35 apart on the timetable, overnight
BA 732 leaves 22 h 35 after FB 851 arrives on the timetable: more than half a day, so not a connection we count.