OS 646 then FR 4767 at Vienna
Prague → Vienna → Bologna
Timetable, Vienna time
17:45OS 646 from Prague at the gate
11:50FR 4767 to Bologna leaves the gate
18 h 05 apart on the timetable, overnight
FR 4767 leaves 18 h 05 after OS 646 arrives on the timetable: more than half a day, so not a connection we count.