FR 879 then OS 404 at Barcelona
Venezia → Barcelona → Vienna
Timetable, Barcelona time
21:10FR 879 from Venezia at the gate
18:10OS 404 to Vienna leaves the gate
21 h apart on the timetable, overnight
OS 404 leaves 21 h after FR 879 arrives on the timetable: more than half a day, so not a connection we count.