W6 2441 then A3 602 at Athens
Budapest → Athens → London Heathrow
Timetable, Athens time
20:55W6 2441 from Budapest at the gate
13:25A3 602 to London Heathrow leaves the gate
16 h 30 apart on the timetable, overnight
A3 602 leaves 16 h 30 after W6 2441 arrives on the timetable: more than half a day, so not a connection we count.