UA 4367 then LN 744 at Dulles
Rochester → Washington → Buffalo
Timetable, Washington time
11:54UA 4367 from Rochester at the gate
04:00LN 744 to Buffalo leaves the gate
16 h 06 apart on the timetable, overnight
LN 744 leaves 16 h 06 after UA 4367 arrives on the timetable: more than half a day, so not a connection we count.