HV 6002 then KL 1521 at Schiphol
Porto → Amsterdam → Barcelona
Timetable, Amsterdam time
23:55HV 6002 from Porto at the gate
20:55KL 1521 to Barcelona leaves the gate
21 h apart on the timetable, overnight
KL 1521 leaves 21 h after HV 6002 arrives on the timetable: more than half a day, so not a connection we count.