OS 722 then FR 7350 at Vienna
Belgrade → Vienna → Barcelona
Timetable, Vienna time
12:15OS 722 from Belgrade at the gate
07:05FR 7350 to Barcelona leaves the gate
18 h 50 apart on the timetable, overnight
FR 7350 leaves 18 h 50 after OS 722 arrives on the timetable: more than half a day, so not a connection we count.