DL 5232 then DL 1454 at Detroit
Memphis → Detroit → Washington National
Timetable, Detroit time
20:50DL 5232 from Memphis at the gate
14:59DL 1454 to Washington National leaves the gate
18 h 09 apart on the timetable, overnight
DL 1454 leaves 18 h 09 after DL 5232 arrives on the timetable: more than half a day, so not a connection we count.