DL 5622 then DL 5679 at Boston
Richmond → Boston → Louisville
Timetable, Boston time
13:15DL 5622 from Richmond at the gate
09:55DL 5679 to Louisville leaves the gate
20 h 40 apart on the timetable, overnight
DL 5679 leaves 20 h 40 after DL 5622 arrives on the timetable: more than half a day, so not a connection we count.