BA 893 then BA 352 at Heathrow
Sofia → London → Nice
Timetable, London time
21:50BA 893 from Sofia at the gate
20:40BA 352 to Nice leaves the gate
22 h 50 apart on the timetable, overnight
BA 352 leaves 22 h 50 after BA 893 arrives on the timetable: more than half a day, so not a connection we count.