Question: How long did the war which Clive Ponting leaked documents about last?

Context paragraphs:
World Jewish Congress lawsuit against Swiss banks: The World Jewish Congress lawsuit against Swiss banks was launched to retrieve deposits made into Swiss banks by victims of Nazi persecution during and prior to World War II.  Initiated in 1995 as WJC negotiations with both the Swiss government and its banks over burdensome proof-of-ownership requirements for accounts, strong support from United States politicians and leaked documents from a bank guard pressured a settlement in 1998 in a U.S. court for multiple classes of people affected by government and banking practices.  As of 2015, $1.28 billion USD has been disbursed for 457,100 claimants.

1940: Myth and Reality: 1940: Myth and Reality (ISBN  ) is a controversial 1990 book by Clive Ponting and published by Hamish Hamilton.  It is a revisionist history of the Second World War, particularly the divergences between the rhetoric and the reality in relation to popular British narratives.  The revisionism is different from that of, for example, "'The Battle of Britain: Myth and Reality", a 2000 book by Richard Overy, and draws different (arguably more pessimistic) conclusions.  The book caused a minor sensation when published, but few of the revelations were new, most having been published in other books in the previous 21 years.

The Cigarette Papers: The Cigarette Papers is a 1996 non-fiction book by Stanton A. Glantz (editor), John Slade (editor), Lisa A. Bero (editor), Peter Hanauer (editor), Deborah E. Barnes (editor), and C. Everett Koop (Foreword), analyzing leaked documents that for the first time proved "tobacco companies had long known the grave dangers of smoking, and did nothing about it."  In May 1994, 4,000 pages of internal tobacco industry documents were sent to the office of Professor Stanton Glantz, a well-known anti-smoking activist, at the University of California, San Francisco.  The source of these "cigarette papers" was identified only as Mr. Butts.  The documents provide an inside look at the internal activities of American tobacco company, Brown & Williamson, over more than 30 years.

Bouwfonds: Bouwfonds is an international real estate company and one of the largest in the Netherlands.  The company was established in 1946, just after the Second World War, as local government property developer with the aim to help working-class people buy their own home.  In 2000 it was sold to ABN Amro.  According to a recent report from the Dutch daily "De Volkskrant" the circumstances under which the privatization took place constitute an economic scandal.  As the report claims " (...) Bouwfonds staff leaked documents to ABN Amro CEO Rijkman Groenink.  These included confidential details about a bid by ING, allowing ABN Amro to trump the offer." .  Since December 2006, Bouwfonds has been part of Rabo Real Estate Group.

Panama Papers: The Panama Papers are 11.5 million leaked documents that detail financial and attorney–client information for more than 214,488 offshore entities.  The documents, some dating back to the 1970s, were created by, and taken from, Panamanian law firm and corporate service provider Mossack Fonseca, and were leaked in 2015 by an anonymous source.

Clive Ponting: Clive Sheridan Ponting (born 13 April 1946) is a former senior civil servant, best known for leaking documents about the sinking of the "Belgrano" in the Falklands War.  He is the author of a number of revisionist books on British and world history.

Halloween documents: The Halloween documents comprise a series of confidential Microsoft memoranda on potential strategies relating to free software, open-source software, and to Linux in particular, and a series of media responses to these memoranda.  Both the leaked documents and the responses were published by Eric S. Raymond in 1998.

Falklands War: The Falklands War (Spanish: "Guerra de las Malvinas" ), also known as the Falklands Conflict, Falklands Crisis, South Atlantic Conflict, and the "Guerra del Atlántico Sur" (Spanish for "South Atlantic War"), was a ten-week war between Argentina and the United Kingdom over two British overseas territories in the South Atlantic: the Falkland Islands, and South Georgia and the South Sandwich Islands.  It began on Friday, 2 April 1982, when Argentina invaded and occupied the Falkland Islands (and, the following day, South Georgia and the South Sandwich Islands) in an attempt to establish the sovereignty it had claimed over them.  On 5 April, the British government dispatched a naval task force to engage the Argentine Navy and Air Force before making an amphibious assault on the islands.  The conflict lasted 74 days and ended with the Argentine surrender on 14 June 1982, returning the islands to British control.  In total, 649 Argentine military personnel, 255 British military personnel, and three Falkland Islanders died during the hostilities.

Anthony McCowan: Sir Anthony James Denys McCowan (12 January 1928 – 3 July 2003) was a British barrister and judge of the High Court of Justice and Court of Appeal best known for trying the case of Clive Ponting in 1985.  After studying at Epsom College he won a scholarship to study history at Brasenose College, Oxford, where he switched to law, and he was called to the Bar in 1951.  After gaining a strong practice in criminal, property and personal injury law he was made a Queen's Counsel in 1972, and was appointed a judge of the Queen's Bench Division of the High Court of Justice in 1981.  In 1989 he became a judge of the Court of Appeal, but only sat for eight years until ill health forced him to retire in 1997.  He died on 3 July 2003.

Spy Cables: The Spy Cables are a series of leaked documents from global intelligence agencies that were published by Al Jazeera and "The Guardian" in 2015.  The documents date from 2006 to December 2014 and are largely derived from communications between South Africa's State Security Agency and various agencies.

Supporting paragraphs: Clive Ponting Falklands War
Answer: 74 days