UA 3913 then UA 7 at Houston
Denver → Houston → Tokyo Narita
Timetable, Houston time
21:22UA 3913 from Denver at the gate
10:25UA 7 to Tokyo Narita leaves the gate
13 h 03 apart on the timetable, overnight
UA 7 leaves 13 h 03 after UA 3913 arrives on the timetable: more than half a day, so not a connection we count.