BA 597 then BA 774 at Heathrow
Venezia → London → Oslo
Timetable, London time
19:15BA 597 from Venezia at the gate
18:55BA 774 to Oslo leaves the gate
23 h 40 apart on the timetable, overnight
BA 774 leaves 23 h 40 after BA 597 arrives on the timetable: more than half a day, so not a connection we count.