Mont. Code Ann. § 27-18-1503

Within 2 days after or at any time before the service of the writ of attachment upon the defendant, the defendant may take exception to the sufficiency of the sureties, and if the defendant fails to do so, the defendant is considered to have waived all objections to the sureties. When an exception is taken, the sureties shall, within 3 days after notice by the defendant of not less than 1 day, justify before the justice, and upon failure to justify or if others in their place fail to justify at the time and place appointed, the justice shall make an order vacating the writ of attachment.