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5 days according to this link: http://forum.freeadvice.com/landlord-tenant-issues-42/eviction-south-carolina-70786.html

See SECTION 27-40-710. Noncompliance with rental agreement; failure to pay rent; removal of evicted tenant's
personal property.

"If rent is unpaid when due and the tenant fails to pay rent within five days from the date due or the tenant is
in violation of Section 27-40-540, the landlord may terminate the rental agreement provided the landlord has
given the tenant written notice of nonpayment and his intention to terminate the rental agreement if the rent is not paid within that period. The landlord's obligation to provide notice under this section is satisfied for any lease
term after the landlord has given one such notice to the tenant or if the notice is contained in conspicuous
language in a written rental agreement."