FR 1645 then FR 1814 at Fiumicino
Vienna → Rome → Porto
Timetable, Rome time
08:30FR 1645 from Vienna at the gate
07:45FR 1814 to Porto leaves the gate
23 h 15 apart on the timetable, overnight
FR 1814 leaves 23 h 15 after FR 1645 arrives on the timetable: more than half a day, so not a connection we count.