IB 5355 then IB 5170 at Barcelona
Milan → Barcelona → Bilbao
Timetable, Barcelona time
14:55IB 5355 from Milan at the gatealso LL 5355, VY 6043
14:40IB 5170 to Bilbao leaves the gate
23 h 45 apart on the timetable, overnight
IB 5170 leaves 23 h 45 after IB 5355 arrives on the timetable: more than half a day, so not a connection we count.