LH 1870 then U2 1684 at Fiumicino
Munich → Rome → Nice
Timetable, Rome time
18:00LH 1870 from Munich at the gate
12:25U2 1684 to Nice leaves the gate
18 h 25 apart on the timetable, overnight
U2 1684 leaves 18 h 25 after LH 1870 arrives on the timetable: more than half a day, so not a connection we count.