OS 553 then FR 1198 at Fiumicino
Vienna → Rome → Athens
Timetable, Rome time
14:15OS 553 from Vienna at the gate
12:10FR 1198 to Athens leaves the gate
21 h 55 apart on the timetable, overnight
FR 1198 leaves 21 h 55 after OS 553 arrives on the timetable: more than half a day, so not a connection we count.