UA 1689 then ET 501 at Dulles
Tampa → Washington → Addis Ababa
Timetable, Washington time
10:46UA 1689 from Tampa at the gate
10:00ET 501 to Addis Ababa leaves the gate
23 h 14 apart on the timetable, overnight
ET 501 leaves 23 h 14 after UA 1689 arrives on the timetable: more than half a day, so not a connection we count.