U2 1683 then IB 656 at Fiumicino
Nice → Rome → Madrid
Timetable, Rome time
07:55U2 1683 from Nice at the gate
20:20IB 656 to Madrid leaves the gate
12 h 25 apart on the timetable
IB 656 leaves 12 h 25 after U2 1683 arrives on the timetable: more than half a day, so not a connection we count.