FR 4768 then OS 273 at Vienna
Bologna → Vienna → Hannover
Timetable, Vienna time
17:50FR 4768 from Bologna at the gate
12:55OS 273 to Hannover leaves the gate
19 h 05 apart on the timetable, overnight
OS 273 leaves 19 h 05 after FR 4768 arrives on the timetable: more than half a day, so not a connection we count.