HV 6868 then U2 7927 at Schiphol
Athens → Amsterdam → Prague
Timetable, Amsterdam time
14:55HV 6868 from Athens at the gate
07:15U2 7927 to Prague leaves the gate
16 h 20 apart on the timetable, overnight
U2 7927 leaves 16 h 20 after HV 6868 arrives on the timetable: more than half a day, so not a connection we count.