OS 722 then FR 755 at Vienna
Belgrade → Vienna → Stockholm
Timetable, Vienna time
12:15OS 722 from Belgrade at the gate
07:45FR 755 to Stockholm leaves the gate
19 h 30 apart on the timetable, overnight
FR 755 leaves 19 h 30 after OS 722 arrives on the timetable: more than half a day, so not a connection we count.