EC 7154 then LL 5508 at Barcelona
Milan → Barcelona → Bilbao
Timetable, Barcelona time
23:15EC 7154 from Milan at the gate
21:35LL 5508 to Bilbao leaves the gate
22 h 20 apart on the timetable, overnight
LL 5508 leaves 22 h 20 after EC 7154 arrives on the timetable: more than half a day, so not a connection we count.