FR 44 then OS 139 at Vienna
Athens → Vienna → Zurich
Timetable, Vienna time
17:25FR 44 from Athens at the gate
12:55OS 139 to Zurich leaves the gate
19 h 30 apart on the timetable, overnight
OS 139 leaves 19 h 30 after FR 44 arrives on the timetable: more than half a day, so not a connection we count.