BA 941 then BA 580 at Heathrow
Düsseldorf → London → Milan
Timetable, London time
07:45BA 941 from Düsseldorf at the gate
07:10BA 580 to Milan leaves the gate
23 h 25 apart on the timetable, overnight
BA 580 leaves 23 h 25 after BA 941 arrives on the timetable: more than half a day, so not a connection we count.