UA 3913 then UA 6345 at Houston
Denver → Houston → Albuquerque
Timetable, Houston time
21:22UA 3913 from Denver at the gate
12:02UA 6345 to Albuquerque leaves the gate
14 h 40 apart on the timetable, overnight
UA 6345 leaves 14 h 40 after UA 3913 arrives on the timetable: more than half a day, so not a connection we count.