BA 585 then BA 774 at Heathrow
Milan Linate → London → Oslo
Timetable, London time
21:30BA 585 from Milan Linate at the gate
18:55BA 774 to Oslo leaves the gate
21 h 25 apart on the timetable, overnight
BA 774 leaves 21 h 25 after BA 585 arrives on the timetable: more than half a day, so not a connection we count.