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It'll take you about an hour to get up there from Claremont. Probably around 2 hours if you are playing by yourself. It is never crowded.
If you happen to lose a disc in the thorns or off a cliff, it'll take you much longer.
Sunset wasn't too bad when I went last year. It was easy to find most of the holes. There are a good amount of bums though. They enjoy it when people loan them discs to play with them.
With that being said, the DG courses in Las Vegas aren't very good. But I'm spoiled by living in Southern...