UA 575 then UA 3755 at Houston
New York LaGuardia → Houston → Lubbock
Timetable, Houston time
09:10UA 575 from New York LaGuardia at the gate
22:10UA 3755 to Lubbock leaves the gate
13 h apart on the timetable
UA 3755 leaves 13 h after UA 575 arrives on the timetable: more than half a day, so not a connection we count.