HV 6002 then KL 1835 at Schiphol
Porto → Amsterdam → Stuttgart
Timetable, Amsterdam time
23:55HV 6002 from Porto at the gate
21:20KL 1835 to Stuttgart leaves the gate
21 h 25 apart on the timetable, overnight
KL 1835 leaves 21 h 25 after HV 6002 arrives on the timetable: more than half a day, so not a connection we count.