DL 5600 then DL 1655 at Boston
Washington National → Boston → San Francisco
Timetable, Boston time
17:11DL 5600 from Washington National at the gate
16:50DL 1655 to San Francisco leaves the gate
23 h 39 apart on the timetable, overnight
DL 1655 leaves 23 h 39 after DL 5600 arrives on the timetable: more than half a day, so not a connection we count.