BA 775 then BA 594 at Heathrow
Oslo → London → Venezia
Timetable, London time
09:00BA 775 from Oslo at the gate
08:05BA 594 to Venezia leaves the gate
23 h 05 apart on the timetable, overnight
BA 594 leaves 23 h 05 after BA 775 arrives on the timetable: more than half a day, so not a connection we count.