DL 336 then DL 5595 at JFK
Denver → New York → Washington
Timetable, New York time
12:47DL 336 from Denver at the gate
10:25DL 5595 to Washington leaves the gate
21 h 38 apart on the timetable, overnight
DL 5595 leaves 21 h 38 after DL 336 arrives on the timetable: more than half a day, so not a connection we count.