W6 2441 then GQ 348 at Athens
Budapest → Athens → Santorini
Timetable, Athens time
20:55W6 2441 from Budapest at the gate
13:30GQ 348 to Santorini leaves the gate
16 h 35 apart on the timetable, overnight
GQ 348 leaves 16 h 35 after W6 2441 arrives on the timetable: more than half a day, so not a connection we count.