RO 261 then GQ 671 at Istanbul
Bucharest → Istanbul → Athens
Timetable, Istanbul time
10:50RO 261 from Bucharest at the gate
10:30GQ 671 to Athens leaves the gate
23 h 40 apart on the timetable, overnight
GQ 671 leaves 23 h 40 after RO 261 arrives on the timetable: more than half a day, so not a connection we count.