FR 4584 then LA 5744 at Barcelona
Porto → Barcelona → Nantes
Timetable, Barcelona time
18:35FR 4584 from Porto at the gate
13:40LA 5744 to Nantes leaves the gate
19 h 05 apart on the timetable, overnight
LA 5744 leaves 19 h 05 after FR 4584 arrives on the timetable: more than half a day, so not a connection we count.