UA 3547 then DL 5665 at Boston
Newark → Boston → Richmond
Timetable, Boston time
17:45UA 3547 from Newark at the gate
15:20DL 5665 to Richmond leaves the gate
21 h 35 apart on the timetable, overnight
DL 5665 leaves 21 h 35 after UA 3547 arrives on the timetable: more than half a day, so not a connection we count.