This is my second visit to Quest Diagnostics. Both times I did not have an appointment. I use this facility because it's close to my house when I don't want to drive to Nellis AFB during morning rush hour and encounter the same wait. I think Labs in general are a place no one wants to be so Ewww. The girl at the front desk was very good and straight forward in dealing with clients with all things considered.
You can make appointments online via their website. I tried last year as a new patient but got tripped up and did the walk-in process instead.
The check-in process is for you to input your personal data into a tablet at the check-in counter. (As I'm sitting here waiting, I feel empathy for the check-in staff. It's embarrassing how many people who check-in can't follow computer prompts to put in your personal data. The dang screen looks like it was designed for preschoolers.) Then you have a seat until you're called back up verify your order. The wait times are announced by staff dependent on how many people are ahead of you. Once you're up, they call you back and do the deed. End of exam.
I don't know how many lab techs they have working on any given day but they are not as quick as their counterparts at Nellis AFB. So In comparison the lab at Nellis functions very efficiently and Quest is good for convenience in locations.