QR 141 then FR 4545 at Barcelona
Doha → Barcelona → Porto
Timetable, Barcelona time
20:45QR 141 from Doha at the gatealso IB 6143
20:40FR 4545 to Porto leaves the gate
23 h 55 apart on the timetable, overnight
FR 4545 leaves 23 h 55 after QR 141 arrives on the timetable: more than half a day, so not a connection we count.