FR 4768 then OS 643 at Vienna
Bologna → Vienna → Prague
Timetable, Vienna time
09:50FR 4768 from Bologna at the gate
09:25OS 643 to Prague leaves the gate
23 h 35 apart on the timetable, overnight
OS 643 leaves 23 h 35 after FR 4768 arrives on the timetable: more than half a day, so not a connection we count.