FR 4586 then QR 3655 at Barcelona
Porto → Barcelona → Nice
Timetable, Barcelona time
21:10FR 4586 from Porto at the gate
19:50QR 3655 to Nice leaves the gatealso LA 5778
22 h 40 apart on the timetable, overnight
QR 3655 leaves 22 h 40 after FR 4586 arrives on the timetable: more than half a day, so not a connection we count.