Make an appointment.
If you have an appointment, it takes the technician about 20 minutes to complete the smog check. Mata Chevrolet is not a "STAR" certified smog station as required for many older vehicles and R.V's.
I would say at least an hour maybe longer depending on how many other customers they have. I recommend making an appointment. They offer a shuttle service ride home for free if you don't want to wait there. You will need to arrange your own return ride to pick up your vehicle when it's done, if you use the shuttle service.
Idk I went for a oil change
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