S.C. Code Ann. § 15-29-60: Length of time legal sales shall be advertised.

All notices for the sale of any real estate under execution or order of court shall be advertised for twenty-one days, that is to say once a week for at least three weeks prior to such sale. All notices for such sales of personal property, unless otherwise specially ordered, shall be advertised for fifteen days, that is to say once a week for two weeks before such sale.