FR 4584 then LA 5750 at Barcelona
Porto → Barcelona → Alicante
Timetable, Barcelona time
18:35FR 4584 from Porto at the gate
12:40LA 5750 to Alicante leaves the gate
18 h 05 apart on the timetable, overnight
LA 5750 leaves 18 h 05 after FR 4584 arrives on the timetable: more than half a day, so not a connection we count.