N.D. Cent. Code § 35-27-25
Upon written demand by or on behalf of the owner which has been delivered to the lienor and filed with the county recorder, suit must be commenced and filed and a lis pendens as provided in chapter 28-05 must be recorded within thirty days after the date of delivery of the demand or the lien is forfeited. This thirty-day requirement applies regardless of the method of delivery and additional time may not be allowed based on the method of delivery. The demand must inform the lienor that if suit is not commenced and a lis pendens recorded within the thirty days required under this section, the lien is forfeited. A lien is not valid, effective, nor enforceable, unless the lienor commences an action and records with the county recorder a lis pendens within three years after the date of recording of the lien. If a lis pendens is not recorded within the limitations provided by this section, the lien is deemed satisfied.
N.D.C.C. § 35-27-25