KL 1520 then KL 1025 at Schiphol
Barcelona → Amsterdam → Leeds
Timetable, Amsterdam time
22:15KL 1520 from Barcelona at the gate
21:45KL 1025 to Leeds leaves the gate
23 h 30 apart on the timetable, overnight
KL 1025 leaves 23 h 30 after KL 1520 arrives on the timetable: more than half a day, so not a connection we count.