A3 253 then GQ 348 at Athens
Mytilene → Athens → Santorini
Timetable, Athens time
14:00A3 253 from Mytilene at the gate
13:30GQ 348 to Santorini leaves the gate
23 h 30 apart on the timetable, overnight
GQ 348 leaves 23 h 30 after A3 253 arrives on the timetable: more than half a day, so not a connection we count.