A3 275 then A3 992 at Athens
Chios → Athens → Istanbul
Timetable, Athens time
17:00A3 275 from Chios at the gate
13:10A3 992 to Istanbul leaves the gate
20 h 10 apart on the timetable, overnight
A3 992 leaves 20 h 10 after A3 275 arrives on the timetable: more than half a day, so not a connection we count.