S.D. Codified Laws § 23A-41-5
Current with legislation signed by the governor on or before 3/6/2024
Whenever a party has the right or is required to do an act within a prescribed period after the service of a notice or other paper upon him and the notice or other paper is served upon him by mail, three days shall be added to the prescribed period.
SDCL 23A-41-5