BA 248 then BA 594 at Heathrow
Rio De Janeiro → London → Venezia
Timetable, London time
08:20BA 248 from Rio De Janeiro at the gate
08:05BA 594 to Venezia leaves the gate
23 h 45 apart on the timetable, overnight
BA 594 leaves 23 h 45 after BA 248 arrives on the timetable: more than half a day, so not a connection we count.