TK 6902 then QR 246 at Istanbul
Barcelona → Istanbul → Doha
Timetable, Istanbul time
06:25TK 6902 from Barcelona at the gate
20:10QR 246 to Doha leaves the gate
13 h 45 apart on the timetable
QR 246 leaves 13 h 45 after TK 6902 arrives on the timetable: more than half a day, so not a connection we count.