GQ 671 then GQ 274 at Athens
Istanbul → Athens → Corfu
Timetable, Athens time
23:10GQ 671 from Istanbul at the gate
20:10GQ 274 to Corfu leaves the gate
21 h apart on the timetable, overnight
GQ 274 leaves 21 h after GQ 671 arrives on the timetable: more than half a day, so not a connection we count.