FR 7191 then FR 1814 at Fiumicino
Vienna → Rome → Porto
Timetable, Rome time
15:50FR 7191 from Vienna at the gate
12:10FR 1814 to Porto leaves the gate
20 h 20 apart on the timetable, overnight
FR 1814 leaves 20 h 20 after FR 7191 arrives on the timetable: more than half a day, so not a connection we count.