IB 5803 then IB 420 at Barcelona
Catania → Barcelona → Madrid
Timetable, Barcelona time
20:55IB 5803 from Catania at the gatealso LL 5803, VY 6119
18:55IB 420 to Madrid leaves the gatealso IB 420S, LA 1586, LL 3020, VY 5090, AV 6153, QR 6895
22 h apart on the timetable, overnight
IB 420 leaves 22 h after IB 5803 arrives on the timetable: more than half a day, so not a connection we count.