BA 715 then SK 806 at Heathrow
Zurich → London → Oslo
Timetable, London time
16:25BA 715 from Zurich at the gate
15:35SK 806 to Oslo leaves the gate
23 h 10 apart on the timetable, overnight
SK 806 leaves 23 h 10 after BA 715 arrives on the timetable: more than half a day, so not a connection we count.