QR 3754 then QR 4705 at Barcelona
Santander → Barcelona → Porto
Timetable, Barcelona time
19:05QR 3754 from Santander at the gate
13:00QR 4705 to Porto leaves the gatealso IB 5092, LL 5092
17 h 55 apart on the timetable, overnight
QR 4705 leaves 17 h 55 after QR 3754 arrives on the timetable: more than half a day, so not a connection we count.