FR 3801 then FR 4587 at Barcelona
Birmingham (UK) → Barcelona → Porto
Timetable, Barcelona time
15:35FR 3801 from Birmingham (UK) at the gate
09:50FR 4587 to Porto leaves the gate
18 h 15 apart on the timetable, overnight
FR 4587 leaves 18 h 15 after FR 3801 arrives on the timetable: more than half a day, so not a connection we count.