UA 4523 then UA 3755 at Houston
Huntsville → Houston → Lubbock
Timetable, Houston time
08:40UA 4523 from Huntsville at the gate
22:10UA 3755 to Lubbock leaves the gate
13 h 30 apart on the timetable
UA 3755 leaves 13 h 30 after UA 4523 arrives on the timetable: more than half a day, so not a connection we count.