UA 4500 then UA 293 at Dulles
Detroit → Washington → Jacksonville
Timetable, Washington time
21:17UA 4500 from Detroit at the gate
18:55UA 293 to Jacksonville leaves the gate
21 h 38 apart on the timetable, overnight
UA 293 leaves 21 h 38 after UA 4500 arrives on the timetable: more than half a day, so not a connection we count.