At any time within 30 days after the service of summons, the defendant may take exception to the sufficiency of the sureties. If the defendant fails to do so, the defendant is considered to have waived all objections to the sureties.
Mont. Code Ann. § 27-18-715, under Methods of Defending Against Attachment.
Mont. Code Ann. § 27-18-715
At any time within 30 days after the service of summons, the defendant may take exception to the sufficiency of the sureties. If the defendant fails to do so, the defendant is considered to have waived all objections to the sureties.