BA 873 then BA 814 at Heathrow
Krakow → London → Copenhagen
Timetable, London time
18:05BA 873 from Krakow at the gate
14:05BA 814 to Copenhagen leaves the gate
20 h apart on the timetable, overnight
BA 814 leaves 20 h after BA 873 arrives on the timetable: more than half a day, so not a connection we count.