KL 1296 then U2 7927 at Schiphol
Billund → Amsterdam → Prague
Timetable, Amsterdam time
15:45KL 1296 from Billund at the gate
13:10U2 7927 to Prague leaves the gate
21 h 25 apart on the timetable, overnight
U2 7927 leaves 21 h 25 after KL 1296 arrives on the timetable: more than half a day, so not a connection we count.