OS 824 then FR 51 at Vienna
Thessaloniki → Vienna → Treviso
Timetable, Vienna time
16:50OS 824 from Thessaloniki at the gate
13:15FR 51 to Treviso leaves the gate
20 h 25 apart on the timetable, overnight
FR 51 leaves 20 h 25 after OS 824 arrives on the timetable: more than half a day, so not a connection we count.