FR 12 then OS 763 at Vienna
Barcelona → Vienna → Skopje
Timetable, Vienna time
22:50FR 12 from Barcelona at the gate
22:45OS 763 to Skopje leaves the gate
23 h 55 apart on the timetable, overnight
OS 763 leaves 23 h 55 after FR 12 arrives on the timetable: more than half a day, so not a connection we count.