DL 5697 then DL 5704 at Boston
Richmond → Boston → Washington National
Timetable, Boston time
08:00DL 5697 from Richmond at the gate
21:45DL 5704 to Washington National leaves the gate
13 h 45 apart on the timetable
DL 5704 leaves 13 h 45 after DL 5697 arrives on the timetable: more than half a day, so not a connection we count.