UA 2453 then UA 3755 at Houston
Jacksonville → Houston → Lubbock
Timetable, Houston time
08:36UA 2453 from Jacksonville at the gate
22:10UA 3755 to Lubbock leaves the gate
13 h 34 apart on the timetable
UA 3755 leaves 13 h 34 after UA 2453 arrives on the timetable: more than half a day, so not a connection we count.