S.C. Code Ann. § 57-21-110

Each issue of bonds herein authorized shall mature at such time or times as the governing body of the county may determine, but in any event not more than twenty years from the date of issuance, shall bear such date and rate or rates of interest, shall be in such denominations and shall be payable annually or semiannually, in such manner and at such place or places, as the governing body of the county may provide in the resolution or resolutions authorizing the issuance of the same.