BA 246 then BA 590 at Heathrow
São Paulo → London → Venezia
Timetable, London time
06:30BA 246 from São Paulo at the gate
06:10BA 590 to Venezia leaves the gate
23 h 40 apart on the timetable, overnight
BA 590 leaves 23 h 40 after BA 246 arrives on the timetable: more than half a day, so not a connection we count.