LL 5475 then FR 4587 at Barcelona
Nice → Barcelona → Porto
Timetable, Barcelona time
10:15LL 5475 from Nice at the gate
22:55FR 4587 to Porto leaves the gate
12 h 40 apart on the timetable
FR 4587 leaves 12 h 40 after LL 5475 arrives on the timetable: more than half a day, so not a connection we count.