OS 274 then FR 9485 at Vienna
Hannover → Vienna → Cologne
Timetable, Vienna time
16:35OS 274 from Hannover at the gate
08:15FR 9485 to Cologne leaves the gate
15 h 40 apart on the timetable, overnight
FR 9485 leaves 15 h 40 after OS 274 arrives on the timetable: more than half a day, so not a connection we count.