12 years or less.....period. If the president gets only two terms, which seems ok unless there is a loser who is in the White House who happens to have cheated, lied and did whatever to get back in a second term, then why should Representatives and Senators be able to make a career in politics. Career politicians seems to tend to create strongholds, not always for the good, and stagnates servanthood for the people and may even facilitate entitlement to the politician. Changing people more often would either force them to show their hand if they have a private agenda, or make render them less successful in fulfilling their agenda. This should have happened long ago.