OS 405 then QR 4704 at Barcelona
Vienna → Barcelona → Porto
Timetable, Barcelona time
19:45OS 405 from Vienna at the gate
08:35QR 4704 to Porto leaves the gate
12 h 50 apart on the timetable, overnight
QR 4704 leaves 12 h 50 after OS 405 arrives on the timetable: more than half a day, so not a connection we count.