W4 6021 then FR 4585 at Barcelona
Rome → Barcelona → Porto
Timetable, Barcelona time
14:30W4 6021 from Rome at the gate
06:00FR 4585 to Porto leaves the gate
15 h 30 apart on the timetable, overnight
FR 4585 leaves 15 h 30 after W4 6021 arrives on the timetable: more than half a day, so not a connection we count.