BA 865 then BA 592 at Heathrow
Prague → London → Venezia
Timetable, London time
08:15BA 865 from Prague at the gate
07:45BA 592 to Venezia leaves the gate
23 h 30 apart on the timetable, overnight
BA 592 leaves 23 h 30 after BA 865 arrives on the timetable: more than half a day, so not a connection we count.