BA 581 then BA 584 at Heathrow
Milan → London → Milan Linate
Timetable, London time
13:25BA 581 from Milan at the gate
13:15BA 584 to Milan Linate leaves the gate
23 h 50 apart on the timetable, overnight
BA 584 leaves 23 h 50 after BA 581 arrives on the timetable: more than half a day, so not a connection we count.