A3 877 then A3 984 at Athens
Budapest → Athens → Skopje
Timetable, Athens time
19:20A3 877 from Budapest at the gate
17:25A3 984 to Skopje leaves the gate
22 h 05 apart on the timetable, overnight
A3 984 leaves 22 h 05 after A3 877 arrives on the timetable: more than half a day, so not a connection we count.