FR 15 then FR 1242 at Athens
London Stansted → Athens → Budapest
Timetable, Athens time
21:45FR 15 from London Stansted at the gate
18:55FR 1242 to Budapest leaves the gate
21 h 10 apart on the timetable, overnight
FR 1242 leaves 21 h 10 after FR 15 arrives on the timetable: more than half a day, so not a connection we count.