UA 3985 then UA 6086 at Houston
Des Moines → Houston → Shreveport
Timetable, Houston time
10:40UA 3985 from Des Moines at the gate
07:00UA 6086 to Shreveport leaves the gate
20 h 20 apart on the timetable, overnight
UA 6086 leaves 20 h 20 after UA 3985 arrives on the timetable: more than half a day, so not a connection we count.