F9 2350 then UA 534 at Denver
Las Vegas → Denver → Great Falls
Timetable, Denver time
14:41F9 2350 from Las Vegas at the gate
11:45UA 534 to Great Falls leaves the gate
21 h 04 apart on the timetable, overnight
UA 534 leaves 21 h 04 after F9 2350 arrives on the timetable: more than half a day, so not a connection we count.