FR 4584 then LL 5480 at Barcelona
Porto → Barcelona → Nantes
Timetable, Barcelona time
19:05FR 4584 from Porto at the gate
10:45LL 5480 to Nantes leaves the gate
15 h 40 apart on the timetable, overnight
LL 5480 leaves 15 h 40 after FR 4584 arrives on the timetable: more than half a day, so not a connection we count.