A3 275 then GQ 350 at Athens
Chios → Athens → Santorini
Timetable, Athens time
17:00A3 275 from Chios at the gate
15:40GQ 350 to Santorini leaves the gate
22 h 40 apart on the timetable, overnight
GQ 350 leaves 22 h 40 after A3 275 arrives on the timetable: more than half a day, so not a connection we count.