QR 3579 then IB 5340 at Barcelona
Seville → Barcelona → Rome
Timetable, Barcelona time
15:50QR 3579 from Seville at the gate
12:30IB 5340 to Rome leaves the gatealso LA 5839
20 h 40 apart on the timetable, overnight
IB 5340 leaves 20 h 40 after QR 3579 arrives on the timetable: more than half a day, so not a connection we count.