The field office must take all necessary steps to complete the complaint investigation within 60 calendar days of receiving the assignment from the regional office. The Regional Director may grant an extension of this period if the field office shows good cause. The extension, if granted, should not exceed 60 days; this results in a total of no more than 120 calendar days to complete the complaint investigation. Examples of good cause include, but are not limited to, complex legal issues, unavailability of witnesses, untimely responses from the contractor or the number of complainants. The regional office must document the request for extension as well as the disposition of that request.