U2 2921 then KL 1921 at Schiphol
Bristol → Amsterdam → Zurich
Timetable, Amsterdam time
15:50U2 2921 from Bristol at the gate
12:15KL 1921 to Zurich leaves the gate
20 h 25 apart on the timetable, overnight
KL 1921 leaves 20 h 25 after U2 2921 arrives on the timetable: more than half a day, so not a connection we count.