KL 1710 then U2 7925 at Schiphol
Luxembourg → Amsterdam → Prague
Timetable, Amsterdam time
12:10KL 1710 from Luxembourg at the gate
07:00U2 7925 to Prague leaves the gate
18 h 50 apart on the timetable, overnight
U2 7925 leaves 18 h 50 after KL 1710 arrives on the timetable: more than half a day, so not a connection we count.