TK 831 then GQ 671 at Istanbul
Beirut → Istanbul → Athens
Timetable, Istanbul time
13:25TK 831 from Beirut 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 831 arrives on the timetable: more than half a day, so not a connection we count.