"Well here in autumn, in September to be exact, there is another series of holidays back to back, that has been recently referred to as “SILVER WEEKâ€Â. These three holidays are (9/21) “Keiro no Hi†or “Respect for the Aged Dayâ€Â, (9/22) “Kokumin on Kyujitsu†or “Citizen’s Rest Day†which is basically a bridge holiday between the 21st and 23rd, and (9/23) “Shubun no Hi†or “Autumn Equinoxâ€Â. You can have anywhere from a 3 day holiday on up to 9 days by taking a couple of days off and combining them with the weekends. This year these holidays start on a Monday, so we get 5 days off counting Saturday and Sunday. NICE!" The next 5 days in a row won't be until 2015 because of where the weekend falls.
http://itchyokole.com/shoyujapan/2009/09/19/silver-week-japan/