50 CFR § 600.210 - Terms of Council members.
(a) Voting members (other than principal state officials, the Regional Administrators, or their designees) are appointed for a term of 3 years and, except as discussed in paragraphs (b) and (c) of this section, may be reappointed. A voting member's Council service of 18 months or more during a term of office will be counted as service for the entire 3-year term.
(b) The anniversary date for measuring terms of membership is August 11. The Secretary may designate a term of appointment shorter than 3 years, if necessary, to provide for balanced expiration of terms of office. Members may not serve more than three consecutive terms.
(c) A member who has completed three consecutive terms will be eligible for appointment to another term one full year after completion of the third consecutive term.