BA 933 then QR 4 at Heathrow
Düsseldorf → London → Doha
Timetable, London time
15:00BA 933 from Düsseldorf at the gate
14:15QR 4 to Doha leaves the gate
23 h 15 apart on the timetable, overnight
QR 4 leaves 23 h 15 after BA 933 arrives on the timetable: more than half a day, so not a connection we count.