OS 580 then FR 51 at Vienna
Catania → Vienna → Treviso
Timetable, Vienna time
11:50OS 580 from Catania at the gate
06:45FR 51 to Treviso leaves the gate
18 h 55 apart on the timetable, overnight
FR 51 leaves 18 h 55 after OS 580 arrives on the timetable: more than half a day, so not a connection we count.