BA 593 then LX 333 at Heathrow
Venezia → London → Zurich
Timetable, London time
14:05BA 593 from Venezia at the gate
13:45LX 333 to Zurich leaves the gate
23 h 40 apart on the timetable, overnight
LX 333 leaves 23 h 40 after BA 593 arrives on the timetable: more than half a day, so not a connection we count.