S.D. Codified Laws § 60-2-6
Current with legislation signed by the governor on or before 3/6/2024
No contract to render personal service may be enforced against the employee beyond the term of two years from the commencement of service under the contract, but if the employee voluntarily continues services under the contract beyond that time, the contract may be referred to as affording a presumptive measure of the consideration.
SDCL 60-2-6