QR 137 then EW 7521 at Barcelona
Doha → Barcelona → Hamburg
Timetable, Barcelona time
07:05QR 137 from Doha at the gate
19:10EW 7521 to Hamburg leaves the gate
12 h 05 apart on the timetable
EW 7521 leaves 12 h 05 after QR 137 arrives on the timetable: more than half a day, so not a connection we count.