BA 8451 then HV 6867 at Schiphol
London City → Amsterdam → Athens
Timetable, Amsterdam time
10:50BA 8451 from London City at the gate
07:00HV 6867 to Athens leaves the gate
20 h 10 apart on the timetable, overnight
HV 6867 leaves 20 h 10 after BA 8451 arrives on the timetable: more than half a day, so not a connection we count.