BA 585 then BA 512 at Heathrow
Milan Linate → London → Lisbon
Timetable, London time
21:30BA 585 from Milan Linate at the gate
19:40BA 512 to Lisbon leaves the gate
22 h 10 apart on the timetable, overnight
BA 512 leaves 22 h 10 after BA 585 arrives on the timetable: more than half a day, so not a connection we count.