FR 1644 then OS 265 at Vienna
Rome → Vienna → Stuttgart
Timetable, Vienna time
21:30FR 1644 from Rome at the gate
13:20OS 265 to Stuttgart leaves the gate
15 h 50 apart on the timetable, overnight
OS 265 leaves 15 h 50 after FR 1644 arrives on the timetable: more than half a day, so not a connection we count.