EC 7152 then QR 3518 at Barcelona
Milan → Barcelona → Bilbao
Timetable, Barcelona time
14:25EC 7152 from Milan at the gate
13:25QR 3518 to Bilbao leaves the gate
23 h apart on the timetable, overnight
QR 3518 leaves 23 h after EC 7152 arrives on the timetable: more than half a day, so not a connection we count.