TK 2659 then GQ 671 at Istanbul
Sivas → Istanbul → Athens
Timetable, Istanbul time
13:25TK 2659 from Sivas at the gate
10:30GQ 671 to Athens leaves the gate
21 h 05 apart on the timetable, overnight
GQ 671 leaves 21 h 05 after TK 2659 arrives on the timetable: more than half a day, so not a connection we count.