As fast and efficient as you could hope for in a mechanic. I was a walk-in, having seen the big Smog Check sign, and knowing my Buick's registration was due in less than two weeks. I asked for their availability later in the week when they said they could take me right now. From pulling my car in the parking lot to signing my credit card receipt took maybe 40 minutes at most. Conversation was good, as was the service, and price was very reasonable. I'll certainly be back.