BA 873 then BA 742 at Heathrow
Krakow → London → Geneva
Timetable, London time
18:05BA 873 from Krakow at the gate
15:05BA 742 to Geneva leaves the gate
21 h apart on the timetable, overnight
BA 742 leaves 21 h after BA 873 arrives on the timetable: more than half a day, so not a connection we count.