A3 602 then BA 988 at Heathrow
Athens → London → Berlin
Timetable, London time
15:30A3 602 from Athens at the gate
15:10BA 988 to Berlin leaves the gate
23 h 40 apart on the timetable, overnight
BA 988 leaves 23 h 40 after A3 602 arrives on the timetable: more than half a day, so not a connection we count.