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Please help improve this article by introducing appropriate citations of additional sources. (June 2008)
An Act for enlarging the Time of Continuance of Parliaments, appointed by an Act made in the Sixth Year of the Reign of King William and Queen Mary, intituled An Act for the frequent meeting and calling of Parliaments
It did not require Parliaments to last that long, but merely set a maximum length on their life. Most Parliaments in the remainder of the 18th century did indeed last 6 or 7 years, with only two lasting for less time. In the 19th century the average length of a parliament of United Kingdom of Great Britain and Ireland was four years.
The Act was amended in 1911 by the Parliament Act 1911 to change the limit to five years, and then again during the World Wars to extend the Parliaments elected in the 1910 and 1935 general elections until the European wars had ended in 1918 and 1945. One of the demands of the mid-19th-century Chartists (the only one which was not achieved by the 20th century) was for annually-elected parliaments.