QR 3754 then LA 5754 at Barcelona
Santander → Barcelona → Bordeaux
Timetable, Barcelona time
19:05QR 3754 from Santander at the gate
16:40LA 5754 to Bordeaux leaves the gate
21 h 35 apart on the timetable, overnight
LA 5754 leaves 21 h 35 after QR 3754 arrives on the timetable: more than half a day, so not a connection we count.