OS 634 then FR 182 at Vienna
Budapest → Vienna → Sofia
Timetable, Vienna time
15:45OS 634 from Budapest at the gate
15:20FR 182 to Sofia leaves the gate
23 h 35 apart on the timetable, overnight
FR 182 leaves 23 h 35 after OS 634 arrives on the timetable: more than half a day, so not a connection we count.