UA 909 then U2 7925 at Schiphol
Chicago → Amsterdam → Prague
Timetable, Amsterdam time
09:35UA 909 from Chicago at the gate
07:20U2 7925 to Prague leaves the gate
21 h 45 apart on the timetable, overnight
U2 7925 leaves 21 h 45 after UA 909 arrives on the timetable: more than half a day, so not a connection we count.