UA 4300 then UA 3263 at Houston
Lubbock → Houston → Richmond
Timetable, Houston time
13:41UA 4300 from Lubbock at the gate
07:00UA 3263 to Richmond leaves the gate
17 h 19 apart on the timetable, overnight
UA 3263 leaves 17 h 19 after UA 4300 arrives on the timetable: more than half a day, so not a connection we count.