SDCL § 43-4-39: Terminating written offer made prior to disclosure statement.

If the disclosure statement or a material amendment to the disclosure statement is delivered to the buyer after the buyer has made a written offer, the buyer may terminate the offer by delivering a written notice of termination to the seller or the seller's agent within three days after the disclosure statement or amendment is delivered in person or within six days after the disclosure statement or amendment is delivered by deposit in the mail.