BA 807 then A3 601 at Heathrow
Copenhagen → London → Athens
Timetable, London time
12:50BA 807 from Copenhagen at the gate
12:15A3 601 to Athens leaves the gate
23 h 25 apart on the timetable, overnight
A3 601 leaves 23 h 25 after BA 807 arrives on the timetable: more than half a day, so not a connection we count.