It's pretty common to many nonprofit boards of directors to have board member terms of three years, to permit up to two terms, and, to enable a board member who has termed out to be re-elected after a year off following the end of their second term.
This practice is common and often by-law codified for it provides a renewal break for a board member who has completed their service and provides the possibility to recruit new "blood".
Meanwhile, from a bit of research I have found that it is not so uncommon that some of these retired members are actually willing to return to serve another two terms. What I can't find however is whether these board members just have to express their intent and poof, they have a new term OR they express their interest and must go through the exact same screening other candidates for a seat must endure. The only reference to what folks do do about this is to "screen" for how active this candidate is in the organization during their year break. Besides this, nothing more.
Anyone with other experiences, thoughts or policies - please let me know.