UA 668 then UA 6146 at Houston
San Juan → Houston → Little Rock
Timetable, Houston time
18:56UA 668 from San Juan at the gate
18:10UA 6146 to Little Rock leaves the gate
23 h 14 apart on the timetable, overnight
UA 6146 leaves 23 h 14 after UA 668 arrives on the timetable: more than half a day, so not a connection we count.