I agree with jamil Gill, go early during opening hours
It depends on the day and time you go in. If you go in right when they open, it's in and out. Otherwise, there's a wait. Sometimes long, sometimes not so long. Appointments are a waste of time.
From the SCDMV website "If you have no driving experience and are interested in getting a beginner's permit, you must hold the beginner's permit for 180 days regardless of your age." http://scdmvonline.com/Driver-Services/Drivers-License/Beginner-Permits
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