BA 965 then BA 600 at Heathrow
Hamburg → London → Venezia
Timetable, London time
21:30BA 965 from Hamburg at the gate
18:10BA 600 to Venezia leaves the gate
20 h 40 apart on the timetable, overnight
BA 600 leaves 20 h 40 after BA 965 arrives on the timetable: more than half a day, so not a connection we count.