FR 7595 then GQ 344 at Athens
Budapest → Athens → Santorini
Timetable, Athens time
00:30FR 7595 from Budapest at the gate
17:15GQ 344 to Santorini leaves the gate
16 h 45 apart on the timetable
GQ 344 leaves 16 h 45 after FR 7595 arrives on the timetable: more than half a day, so not a connection we count.