DL 5641 then DL 5667 at Boston
Cleveland → Boston → Washington National
Timetable, Boston time
20:00DL 5641 from Cleveland at the gate
18:00DL 5667 to Washington National leaves the gate
22 h apart on the timetable, overnight
DL 5667 leaves 22 h after DL 5641 arrives on the timetable: more than half a day, so not a connection we count.