FR 1815 then FR 9903 at Fiumicino
Porto → Rome → Lisbon
Timetable, Rome time
21:10FR 1815 from Porto at the gate
17:15FR 9903 to Lisbon leaves the gate
20 h 05 apart on the timetable, overnight
FR 9903 leaves 20 h 05 after FR 1815 arrives on the timetable: more than half a day, so not a connection we count.