BA 941 then BA 418 at Heathrow
Düsseldorf → London → Luxembourg
Timetable, London time
09:30BA 941 from Düsseldorf at the gate
06:05BA 418 to Luxembourg leaves the gate
20 h 35 apart on the timetable, overnight
BA 418 leaves 20 h 35 after BA 941 arrives on the timetable: more than half a day, so not a connection we count.