HV 6868 then BA 439 at Schiphol
Athens → Amsterdam → London Heathrow
Timetable, Amsterdam time
23:20HV 6868 from Athens at the gate
16:00BA 439 to London Heathrow leaves the gate
16 h 40 apart on the timetable, overnight
BA 439 leaves 16 h 40 after HV 6868 arrives on the timetable: more than half a day, so not a connection we count.