FR 1644 then OS 377 at Vienna
Rome → Vienna → Nice
Timetable, Vienna time
21:30FR 1644 from Rome at the gate
12:35OS 377 to Nice leaves the gate
15 h 05 apart on the timetable, overnight
OS 377 leaves 15 h 05 after FR 1644 arrives on the timetable: more than half a day, so not a connection we count.