IB 2471 then IB 412 at Barcelona
Leon → Barcelona → Madrid
Timetable, Barcelona time
21:35IB 2471 from Leon at the gatealso LL 3101, VY 5871, QR 6959
13:35IB 412 to Madrid leaves the gatealso LA 1524, LA 1577, CX 1926, LL 3012, VY 5060, AV 6172, BA 7081, QR 8004, AA 8776
16 h apart on the timetable, overnight
IB 412 leaves 16 h after IB 2471 arrives on the timetable: more than half a day, so not a connection we count.