KL 644 then HV 6003 at Schiphol
New York JFK → Amsterdam → Porto
Timetable, Amsterdam time
10:30KL 644 from New York JFK at the gate
06:50HV 6003 to Porto leaves the gate
20 h 20 apart on the timetable, overnight
HV 6003 leaves 20 h 20 after KL 644 arrives on the timetable: more than half a day, so not a connection we count.