The Club LAS (terminal 1) using Priority Pass.
According to Priority Pass:
"Opening Hours 05:00 - 23:30 daily Note: Access may be periodically restricted due to space constraints, in particular during the hours of 11:00 - 16:00 daily.
It is located near D33 and right next to Tumi. "

We visited on Feb 5th at around 1:30pm. We had a scheduled layover of 2+20 hours, so we decided to check out one of the 2 lounges at LAS. We arrived at C21 and started walking towards T1 and followed the signs toward D gates. It turns out that navigating towards Tumi on our iphone map AP was very helpful to get an idea as to where we were going. We took the Blue train to get to the lounge and followed the guidance on the phone. It was pretty straight forward. On our return, we took the Blue train back to T1 and then we took the Green train to the C gates. It turns out our next gate (C2) was very close.

I didn't think to ask the capacity of the lounge, but there were several lounge areas. We went into the main dining room. There, they had salad fixings and soup. There was a QR code to order small plates (vegan lettuce wrap, hot Italian slider, bruschetta and chicken taco and a brownie for sweets) and drinks (assorted beers, wines, signature cocktails, and classic cocktails) off the menu. We tried the hot (as in spicy) Italian sliders and thought they were very good.

There were 6 unisex private restrooms. (IIRC, at least 2 had showers, too. )

We thought it was a very nice lounge.