OS 644 then FR 9485 at Vienna
Prague → Vienna → Cologne
Timetable, Vienna time
11:50OS 644 from Prague at the gate
08:15FR 9485 to Cologne leaves the gate
20 h 25 apart on the timetable, overnight
FR 9485 leaves 20 h 25 after OS 644 arrives on the timetable: more than half a day, so not a connection we count.