BJ 640 then GQ 671 at Istanbul
Tunis → Istanbul → Athens
Timetable, Istanbul time
11:50BJ 640 from Tunis at the gate
10:30GQ 671 to Athens leaves the gate
22 h 40 apart on the timetable, overnight
GQ 671 leaves 22 h 40 after BJ 640 arrives on the timetable: more than half a day, so not a connection we count.