FR 7538 then LA 5747 at Barcelona
Milan → Barcelona → Santander
Timetable, Barcelona time
08:05FR 7538 from Milan at the gate
20:15LA 5747 to Santander leaves the gate
12 h 10 apart on the timetable
LA 5747 leaves 12 h 10 after FR 7538 arrives on the timetable: more than half a day, so not a connection we count.