QR 137 then QR 3655 at Barcelona
Doha → Barcelona → Nice
Timetable, Barcelona time
07:05QR 137 from Doha at the gate
19:50QR 3655 to Nice leaves the gatealso LA 5778
12 h 45 apart on the timetable
QR 3655 leaves 12 h 45 after QR 137 arrives on the timetable: more than half a day, so not a connection we count.