KL 1252 then U2 7927 at Schiphol
Helsinki → Amsterdam → Prague
Timetable, Amsterdam time
15:40KL 1252 from Helsinki at the gate
13:10U2 7927 to Prague leaves the gate
21 h 30 apart on the timetable, overnight
U2 7927 leaves 21 h 30 after KL 1252 arrives on the timetable: more than half a day, so not a connection we count.