BA 873 then BA 350 at Heathrow
Krakow → London → Nice
Timetable, London time
18:05BA 873 from Krakow at the gate
17:00BA 350 to Nice leaves the gate
22 h 55 apart on the timetable, overnight
BA 350 leaves 22 h 55 after BA 873 arrives on the timetable: more than half a day, so not a connection we count.