DL 5641 then B6 1955 at Boston
Cleveland → Boston → Washington National
Timetable, Boston time
19:35DL 5641 from Cleveland at the gate
17:10B6 1955 to Washington National leaves the gate
21 h 35 apart on the timetable, overnight
B6 1955 leaves 21 h 35 after DL 5641 arrives on the timetable: more than half a day, so not a connection we count.