A3 606 then U2 8733 at Gatwick
Athens → London → Budapest
Timetable, London time
11:10A3 606 from Athens at the gate
06:35U2 8733 to Budapest leaves the gate
19 h 25 apart on the timetable, overnight
U2 8733 leaves 19 h 25 after A3 606 arrives on the timetable: more than half a day, so not a connection we count.