QF 1 then BA 590 at Heathrow
Sydney → London → Venezia
Timetable, London time
06:15QF 1 from Sydney at the gate
06:10BA 590 to Venezia leaves the gate
23 h 55 apart on the timetable, overnight
BA 590 leaves 23 h 55 after QF 1 arrives on the timetable: more than half a day, so not a connection we count.