UA 3920 then UA 2613 at Houston
Orlando → Houston → Denver
Timetable, Houston time
19:47UA 3920 from Orlando at the gate
14:46UA 2613 to Denver leaves the gate
18 h 59 apart on the timetable, overnight
UA 2613 leaves 18 h 59 after UA 3920 arrives on the timetable: more than half a day, so not a connection we count.