CZ 759 then FR 4587 at Barcelona
Doha → Barcelona → Porto
Timetable, Barcelona time
07:05CZ 759 from Doha at the gatealso IB 6201, LA 7405
21:45FR 4587 to Porto leaves the gate
14 h 40 apart on the timetable
FR 4587 leaves 14 h 40 after CZ 759 arrives on the timetable: more than half a day, so not a connection we count.