A3 877 then A3 154 at Athens
Budapest → Athens → Kavala
Timetable, Athens time
19:20A3 877 from Budapest at the gate
18:00A3 154 to Kavala leaves the gate
22 h 40 apart on the timetable, overnight
A3 154 leaves 22 h 40 after A3 877 arrives on the timetable: more than half a day, so not a connection we count.