FR 1815 then IB 660 at Fiumicino
Porto → Rome → Madrid
Timetable, Rome time
14:00FR 1815 from Porto at the gate
13:25IB 660 to Madrid leaves the gate
23 h 25 apart on the timetable, overnight
IB 660 leaves 23 h 25 after FR 1815 arrives on the timetable: more than half a day, so not a connection we count.