S.C. Code Ann. § 63-15-550: Termination by operation of law of temporary grant of custodial responsibility established by court order.

(A) A temporary order for custodial responsibility issued pursuant to Subarticle 3 shall terminate, if no agreement between the parties to terminate a temporary order for custodial responsibility has been filed, sixty days from the date of the deploying parent's giving notice of having returned from deployment to the other parent and any nonparent granted custodial responsibility.

(B) Any proceedings seeking to prevent termination of a temporary order for custodial responsibility are governed by the law of this State other than this article.