TK 1855 then QR 4704 at Barcelona
Istanbul → Barcelona → Porto
Timetable, Barcelona time
17:15TK 1855 from Istanbul at the gate
08:35QR 4704 to Porto leaves the gate
15 h 20 apart on the timetable, overnight
QR 4704 leaves 15 h 20 after TK 1855 arrives on the timetable: more than half a day, so not a connection we count.