DL 541 then UA 3756 at Dulles
Seattle → Washington → Gainesville
Timetable, Washington time
00:20DL 541 from Seattle at the gate
21:25UA 3756 to Gainesville leaves the gate
21 h 05 apart on the timetable
UA 3756 leaves 21 h 05 after DL 541 arrives on the timetable: more than half a day, so not a connection we count.