TK 1768 then GQ 671 at Istanbul
Prague → Istanbul → Athens
Timetable, Istanbul time
14:20TK 1768 from Prague at the gate
10:30GQ 671 to Athens leaves the gate
20 h 10 apart on the timetable, overnight
GQ 671 leaves 20 h 10 after TK 1768 arrives on the timetable: more than half a day, so not a connection we count.