BA 773 then BA 512 at Heathrow
Oslo → London → Lisbon
Timetable, London time
22:00BA 773 from Oslo at the gate
19:40BA 512 to Lisbon leaves the gate
21 h 40 apart on the timetable, overnight
BA 512 leaves 21 h 40 after BA 773 arrives on the timetable: more than half a day, so not a connection we count.