QR 3579 then IB 5480 at Barcelona
Seville → Barcelona → Nantes
Timetable, Barcelona time
15:35QR 3579 from Seville at the gate
10:45IB 5480 to Nantes leaves the gatealso LL 5480, VY 8140
19 h 10 apart on the timetable, overnight
IB 5480 leaves 19 h 10 after QR 3579 arrives on the timetable: more than half a day, so not a connection we count.