A3 981 then GQ 440 at Athens
Sofia → Athens → Kithira
Timetable, Athens time
12:55A3 981 from Sofia at the gate
12:45GQ 440 to Kithira leaves the gate
23 h 50 apart on the timetable, overnight
GQ 440 leaves 23 h 50 after A3 981 arrives on the timetable: more than half a day, so not a connection we count.