BA 893 then QR 16 at Heathrow
Sofia → London → Doha
Timetable, London time
21:50BA 893 from Sofia at the gate
21:30QR 16 to Doha leaves the gate
23 h 40 apart on the timetable, overnight
QR 16 leaves 23 h 40 after BA 893 arrives on the timetable: more than half a day, so not a connection we count.