Nev. Rev. Stat. § 108.233

1. A lien provided for in NRS 108.221 to 108.246 , inclusive, must not bind the property subject to the lien for a period longer than 6 months after the date on which the notice of lien was recorded, unless: (a) Proceedings are commenced in a proper court within that time to enforce the same; or (b) The time to commence the action is extended by a written instrument signed by the lien claimant and by a person or persons in interest in the property subject to the lien, in which event, and as to only that person or those persons in interest signing the agreement, the time is extended, but no extension is valid unless in writing and recorded in the county recorder's office in which the notice of lien is recorded and unless the extension agreement is recorded within the 6-month period. The extension agreement, to be recorded, must be acknowledged as required by law for the acknowledgment of deeds. An action may be commenced within the extended time only against the persons signing the extension agreement and only as to their interests in the property are affected, and upon the lapse of the time specified in the extension agreement, an action may not thereafter be commenced, nor may a second extension be given.

2. For all purposes, a notice of lien shall be deemed to have expired as a lien against the property after the lapse of the 6-month period provided in subsection 1, and the recording of a notice of lien does not provide actual or constructive notice after the lapse of the 6-month period and as a lien on the property referred to in the notice of lien, unless, before the lapse of the 6-month period an extension agreement has been recorded, in which event, the lien will only continue as a lien on the interests of those persons signing the extension for the period specified in the extension. An extension must not be given for a period in excess of 1 year beyond the date on which the notice of lien is recorded.

3. If there are other notices of lien outstanding against the property, an extension must not be given upon a notice of lien which will tend to delay or postpone the collection of other liens evidenced by a notice of lien or encumbrances against the property.