HV 6004 then KL 1909 at Schiphol
Porto → Amsterdam → Vienna
Timetable, Amsterdam time
23:20HV 6004 from Porto at the gate
18:45KL 1909 to Vienna leaves the gate
19 h 25 apart on the timetable, overnight
KL 1909 leaves 19 h 25 after HV 6004 arrives on the timetable: more than half a day, so not a connection we count.