FR 1644 then FR 51 at Vienna
Rome → Vienna → Treviso
Timetable, Vienna time
21:30FR 1644 from Rome at the gate
20:05FR 51 to Treviso leaves the gate
22 h 35 apart on the timetable, overnight
FR 51 leaves 22 h 35 after FR 1644 arrives on the timetable: more than half a day, so not a connection we count.