Md. Code, Real Property § 9–109

The right to enforce any lien established under this subtitle expires at the end of one year from the day on which the petition to establish the lien was first filed. During this time the claimant may file a petition in the lien proceedings to enforce the lien or execute on any bond given to obtain a release of the land and building from the lien. If such petition is filed within the one-year period, the right to a lien or the lien, or any bond given to obtain a release of lien, shall remain in full force and effect until the conclusion of the enforcement proceedings and thereafter only in accordance with the decree entered in the case.