KL 662 then HV 6867 at Schiphol
Houston → Amsterdam → Athens
Timetable, Amsterdam time
07:35KL 662 from Houston at the gate
07:00HV 6867 to Athens leaves the gate
23 h 25 apart on the timetable, overnight
HV 6867 leaves 23 h 25 after KL 662 arrives on the timetable: more than half a day, so not a connection we count.