SN 3697 then LA 5768 at Barcelona
Brussels → Barcelona → Santander
Timetable, Barcelona time
11:25SN 3697 from Brussels at the gate
11:00LA 5768 to Santander leaves the gate
23 h 35 apart on the timetable, overnight
LA 5768 leaves 23 h 35 after SN 3697 arrives on the timetable: more than half a day, so not a connection we count.