Unfortunately as many times as they're re-elected. Do you honestly think that they would introduce legislation that would limit their terms in office?
It is quite unfortunate, it almost seems unconstitutional for any one portion of our government to be able to decide the stipulations of their job, it seems that there is a lack of checks and balances made. They pick their own pay seeing as the trend is re-election for those who have been there a few terms. It almost seems like America's best interest gets lost in greed.