AA 3232 then UA 685 at Houston
Phoenix → Houston → Denver
Timetable, Houston time
23:54AA 3232 from Phoenix at the gate
20:31UA 685 to Denver leaves the gate
20 h 37 apart on the timetable, overnight
UA 685 leaves 20 h 37 after AA 3232 arrives on the timetable: more than half a day, so not a connection we count.