BA 94 then BA 594 at Heathrow
Montréal → London → Venezia
Timetable, London time
08:55BA 94 from Montréal at the gate
08:05BA 594 to Venezia leaves the gate
23 h 10 apart on the timetable, overnight
BA 594 leaves 23 h 10 after BA 94 arrives on the timetable: more than half a day, so not a connection we count.