FR 6875 then FR 4545 at Barcelona
Dublin → Barcelona → Porto
Timetable, Barcelona time
09:35FR 6875 from Dublin at the gate
09:20FR 4545 to Porto leaves the gate
23 h 45 apart on the timetable, overnight
FR 4545 leaves 23 h 45 after FR 6875 arrives on the timetable: more than half a day, so not a connection we count.