"District days/district work period . Time off from Washington to go home and work on constituent matters. The House has a periodic schedule of district work days; the Senate takes off one week each month. This practice has been abused by some members, who use it as vacation time."
-- The Congress Dictionary, by Paul Dickson and Paul Clancy.
(Editor's Note: The copyright for this source is 1993, which shows how much, and how little, things change.)