QR 3579 then TK 1854 at Barcelona
Seville → Barcelona → Istanbul
Timetable, Barcelona time
15:50QR 3579 from Seville at the gate
12:20TK 1854 to Istanbul leaves the gate
20 h 30 apart on the timetable, overnight
TK 1854 leaves 20 h 30 after QR 3579 arrives on the timetable: more than half a day, so not a connection we count.