A person whose wages or salary has remained unpaid for 15 days or more after due has a right to sue upon the bond described in this part for the recovery of the person's wages or salary.
Mont. Code Ann. § 39-3-517, under Wage Protection for Certain Employees of Mineral and Oil Industry.
Mont. Code Ann. § 39-3-517
A person whose wages or salary has remained unpaid for 15 days or more after due has a right to sue upon the bond described in this part for the recovery of the person's wages or salary.