EC 7102 then QR 4704 at Barcelona
Basel → Barcelona → Porto
Timetable, Barcelona time
14:40EC 7102 from Basel at the gate
08:35QR 4704 to Porto leaves the gate
17 h 55 apart on the timetable, overnight
QR 4704 leaves 17 h 55 after EC 7102 arrives on the timetable: more than half a day, so not a connection we count.