On July 22, 2008, in the aftermath of the Southwest Airlines inspection scandal, a bill was unanimously approved in the House to tighten regulations concerning airplane maintenance procedures, including the establishment of a whistleblower office and a two-year "cooling off" period that FAA inspectors or supervisors of inspectors must wait before they can work for those they regulated. The bill also required rotation of principal maintenance inspectors and stipulated that the word "customer" properly applies to the flying public, not those entities regulated by the FAA. The bill died in a Senate committee that year.

Answer this question, if possible (if impossible, reply "unanswerable"): how long was the "cooling off" period that the FAA inspectors or supervisers of inspectors must wait before they can work for those they regulate?
two-year