QR 3754 then FR 7351 at Barcelona
Santander → Barcelona → Vienna
Timetable, Barcelona time
19:05QR 3754 from Santander at the gate
10:05FR 7351 to Vienna leaves the gate
15 h apart on the timetable, overnight
FR 7351 leaves 15 h after QR 3754 arrives on the timetable: more than half a day, so not a connection we count.