GQ 219 then GQ 340 at Athens
Heraklion → Athens → Santorini
Timetable, Athens time
12:20GQ 219 from Heraklion at the gate
07:40GQ 340 to Santorini leaves the gate
19 h 20 apart on the timetable, overnight
GQ 340 leaves 19 h 20 after GQ 219 arrives on the timetable: more than half a day, so not a connection we count.