BA 581 then BA 440 at Heathrow
Milan → London → Amsterdam
Timetable, London time
14:35BA 581 from Milan at the gate
14:10BA 440 to Amsterdam leaves the gate
23 h 35 apart on the timetable, overnight
BA 440 leaves 23 h 35 after BA 581 arrives on the timetable: more than half a day, so not a connection we count.