BA 935 then SK 506 at Heathrow
Düsseldorf → London → Copenhagen
Timetable, London time
18:00BA 935 from Düsseldorf at the gate
17:00SK 506 to Copenhagen leaves the gate
23 h apart on the timetable, overnight
SK 506 leaves 23 h after BA 935 arrives on the timetable: more than half a day, so not a connection we count.