OS 401 then QR 4704 at Barcelona
Vienna → Barcelona → Porto
Timetable, Barcelona time
09:10OS 401 from Vienna at the gatealso LA 5045
08:35QR 4704 to Porto leaves the gate
23 h 25 apart on the timetable, overnight
QR 4704 leaves 23 h 25 after OS 401 arrives on the timetable: more than half a day, so not a connection we count.