BA 941 then BA 504 at Heathrow
Düsseldorf → London → Lisbon
Timetable, London time
09:30BA 941 from Düsseldorf at the gate
09:05BA 504 to Lisbon leaves the gate
23 h 35 apart on the timetable, overnight
BA 504 leaves 23 h 35 after BA 941 arrives on the timetable: more than half a day, so not a connection we count.