BA 631 then BA 792 at Heathrow
Athens → London → Göteborg
Timetable, London time
16:30BA 631 from Athens at the gate
16:10BA 792 to Göteborg leaves the gate
23 h 40 apart on the timetable, overnight
BA 792 leaves 23 h 40 after BA 631 arrives on the timetable: more than half a day, so not a connection we count.