BA 493 then A3 605 at Heathrow
Gibraltar → London → Athens
Timetable, London time
20:45BA 493 from Gibraltar at the gate
19:00A3 605 to Athens leaves the gate
22 h 15 apart on the timetable, overnight
A3 605 leaves 22 h 15 after BA 493 arrives on the timetable: more than half a day, so not a connection we count.