S.C. Code § 4-12-45
2003 Act No. 69, Section 3.YY.2, in part provides as follows:
"(i) for those projects which have been granted a two-year extension of time to complete the project and that two-year period has not expired, the sponsor may at any time during the two-year extension request an additional three years to complete the project, and (ii) the county and the sponsor may agree to waive the provisions of Section 4-12-45 under any agreement whenever executed."