A3 991 then GQ 2 at Athens
Istanbul → Athens → Kastoria
Timetable, Athens time
12:00A3 991 from Istanbul at the gate
10:15GQ 2 to Kastoria leaves the gate
22 h 15 apart on the timetable, overnight
GQ 2 leaves 22 h 15 after A3 991 arrives on the timetable: more than half a day, so not a connection we count.