W6 2061 then U2 1684 at Fiumicino
Krakow → Rome → Nice
Timetable, Rome time
20:45W6 2061 from Krakow at the gate
14:45U2 1684 to Nice leaves the gate
18 h apart on the timetable, overnight
U2 1684 leaves 18 h after W6 2061 arrives on the timetable: more than half a day, so not a connection we count.