AC 850 then EW 2461 at Heathrow
Calgary → London → Stuttgart
Timetable, London time
09:20AC 850 from Calgary at the gate
08:45EW 2461 to Stuttgart leaves the gate
23 h 25 apart on the timetable, overnight
EW 2461 leaves 23 h 25 after AC 850 arrives on the timetable: more than half a day, so not a connection we count.