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Who really said it

It Will Take Them Ten Years to Prove Me Wrong

Not verified as Winston Churchill — an undocumented anecdote Unknown Undocumented anecdote · earliest related version March 1945
Disputed In copyright

No source has ever been produced for this. The story — Churchill as Chancellor of the Exchequer, told an estimate would take ten years, promising the Prime Minister an answer that afternoon — first appears with this punchline in 1991, in an operations-research journal, and its author says plainly that he heard it at a conference and “never learned whether there was a written source”. The oldest relative Quote Investigator ↗ could find is a March 1945 Coronet magazine item in which Churchill is Prime Minister, the setting is the Second World War, the invented figure is precise to the sixpence, and the punchline is different: it will take the opposition “at least three months and a score of clerks to prove me wrong”. The same writer who published the 1991 version later reported that the Churchill Archive and two Churchill scholars had told him the answer seemed to be “apocryphal”. QI, unusually, declines to rule either way: the evidence, it says, is inadequate for a verdict.

Last verified 1 Sep 2026 · how we verify · spot an error?

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Disputed credit — copy with the correction

“It Will Take Them Ten Years to Prove Me Wrong” Not verified as Winston Churchill. No documented source exists. The oldest related version is a March 1945 Coronet magazine story set in the Second World War with a different punchline; this wording first appears in OR/MS Today, April 1991, whose author heard it at a convention and never found a written source. Quote Investigator declines to reach a verdict. · Verbatim: “If I give him my best guess at three this afternoon, it will take ten years for anyone to prove me wrong.”

The slide-ready mistake: crediting this to Winston Churchill. Use the credit shown above instead.

Can you use it?

Still under copyright (rights held by INFORMS (publisher of OR/MS Today, source of the passage quoted above)). A short, credited quote is generally fine for talks, teaching, and internal decks; for commercial, published, or large-scale reuse, get permission.

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In context

Evoking the themes of truth, doubt and time. Theme: "It Will Take Them Ten Years to Prove Me Wrong". Atmospheric and restrained, cinematic directional light, a muted period-appropriate palette, fine grain and texture. Compose with generous empty space for the quote and a small credit line. No lettering in the image itself.

Minimalist

Minimalist editorial slide for the quote "It Will Take Them Ten Years to Prove Me Wrong". Clean background, a single muted accent color, generous negative space, subtle paper or linen texture, no literal illustration — let the words carry it. Reserve clear space for a serif quote and a small credit line. No lettering in the image itself.

Provenance

The source

Earliest related version
“Cost Accounting” by Louis Hirsch, Coronet, March 1945
That version’s setting
The Second World War, with Churchill as Prime Minister — not the 1920s Exchequer
This wording first appears
“Oracle: Churchill’s Theorem”, OR/MS Today, April 1991, page 80
Quote Investigator’s verdict
None — “current evidence is inadequate to allow a verdict”

The economist said that if he worked full time on the problem with two of his best men it would take ten years to calculate. Churchill then telephoned the prime minister and told him he would provide answers at three in the afternoon. As Churchill replaced the receiver, the economist stammered, “Sir, I want to make sure that you understand what I’ve just told you.” “I understand perfectly,” Churchill grinned, chomping on his cigar. “If I give him my best guess at three this afternoon, it will take ten years for anyone to prove me wrong.” OR/MS Today, April 1991

The earliest appearance of this wording — published in 1991, about an event supposedly of the mid-1920s. The author of this very article told Quote Investigator he had heard the story at an economics convention and never found a written source for it.

Quote Investigator — the 1945 to 2009 chain

How we verified this

  • The oldest version of the story is in Coronet magazine for March 1945, and its details do not match: Churchill is Prime Minister rather than Chancellor, the subject is wartime expenditure rather than the cost of the Great War, the figure he invents runs to “103,429,009 pounds, eight shillings and sixpence”, and the punchline is that it will take the opposition “at least three months and a score of clerks” to disprove the 1945 citation ↗.
  • The ten-year form of the joke turns up in 1984 without Churchill in it at all — a banking article tells it about the head of an African country asked how many elephants his nation has, who reasons that a count taking ten years will take ten years to refute the 1984 variant ↗.
  • The wording quoted here appears in OR/MS Today in April 1991, under the title “Oracle: Churchill’s Theorem”. Its author wrote that he had heard the story “some years ago — at an economics convention, I think — and never learned whether there was a written source” the 1991 article ↗.
  • That same author was the reader who put the question to Quote Investigator, reporting that he had contacted the Churchill Archive and two renowned Churchill scholars and that the answer seemed to be “apocryphal”. A 2009 business book repeating the tale hedges the same way: “I have not been able to confirm the story, so it may fall into the realm of legend” the inquiry and the 2009 telling ↗.
In copyright

Quote sparingly and attribute. The passage reproduced above is from OR/MS Today for April 1991, published by INFORMS — far beyond the 1930 cut-off for the United States public domain — and remains in copyright, as do the 1945 Coronet article, the 1984 and 1998 magazine versions and the 2009 book. Since the remark is not established as Churchill’s, the separate question of his estate’s rights does not arise. This is not legal advice.

Rights status is our research, not legal advice — and copyright varies by country and edition. For commercial or published use, confirm with the rightsholder. See terms.

Fact-check

The attribution problem

This is the rarer kind of case: not a debunked quotation but an unresolved one. Quote Investigator lays out the evidence and then explicitly refuses to rule, and that refusal is the honest answer rather than a gap in the research.

Winston Churchill no source

Nothing in Churchill’s papers, speeches or the Treasury record supports it. The reader who asked Quote Investigator about the story reported that the Churchill Archive and two Churchill scholars had told him it seemed to be apocryphal the inquiry ↗.

A 1945 magazine story ancestor

The Coronet item of March 1945 has the same trick — invent a figure nobody can check — but a different war, a different office, a different sum and a different punchline. It is the ancestor of the anecdote, not an earlier record of it the 1945 text ↗.

An unnamed African head of state drifted

In 1984 and again in 1998 the same joke is told with no Churchill in it at all: a leader asked how many elephants his country has, who announces a number on the reasoning that it will take ten years to refute. A story that works equally well with any protagonist is not evidence about a particular one the elephant versions ↗.

No verdict documented but unverified

QI writes that “current evidence is inadequate to allow a verdict” — the story may be wholly apocryphal, or may have a core of truth obscured by retelling. We report that rather than resolving it for them the conclusion ↗.

No documented source; the oldest relative is a 1945 magazine story with different details, and Quote Investigator expressly reaches no verdict the evidence ↗.

Context

Why the story is told

The anecdote is a joke about forecasting, and it is usually deployed by forecasters — a banker predicting the next century of his industry, an operations researcher introducing a set of projections, a consultant opening a chapter. Its function is to excuse a guess by pointing out that nobody can check it in time to matter, which is a durable professional anxiety and a good reason for a story to keep circulating.

It is also a useful reminder that an honest research verdict is sometimes no verdict. The evidence here does not establish that Churchill said it, and does not establish that he did not; what it establishes is that the story surfaced late, changed shape freely, and has never been anchored to a document.

A joke about unfalsifiable claims that has itself proved unfalsifiable.

Where the story has been

March 1945: Coronet magazine. Churchill as wartime Prime Minister invents a figure precise to the sixpence; the opposition would need three months and a score of clerks to disprove it.

1984: a banking magazine tells the ten-year version about the head of an African nation and a count of elephants. No Churchill.

April 1991: OR/MS Today prints the 1920s Exchequer version with the wording on this page. Its author never found a written source.

1998: the elephant story again, now set in South Africa with a different count; and separately, Mario Cuomo borrows the punchline for a set of century-ahead predictions.

2009: a business book repeats the Churchill version, prefacing it “I have not been able to confirm the story, so it may fall into the realm of legend”.

Explore

Filed under

More provenance-checked quotes on the same theme, each with its reuse status.

Truth Doubt Time

Go further

Dig deeper

Trusted places to keep pulling the thread — primary archives, fact-checks, and scholarship. We show how we used each one before you leave.

Anecdote Origin: It Will Take Them Ten Years to Prove Me Wrongquoteinvestigator.com

The full chain from the 1945 Coronet version through the elephant variants to the 1991 article that carries this wording — and QI’s explicit refusal to reach a verdict.
Winston Churchill — Wikiquoteen.wikiquote.org

Wikiquote’s sourced, disputed and misattributed sections for Churchill — the standard first stop when checking a line pinned on him. This particular anecdote is not among its entries.
Churchillian Driften.wikipedia.org

The named tendency for anonymous anecdotes to be reassigned to Churchill — visible here in the elephant version, which has no Churchill in it.
Winston Churchillen.wikipedia.org

Biography of the statesman the anecdote is pinned on, including his term as Chancellor of the Exchequer.

Popularly credited author

Why it gets pinned on Churchill

Winston Churchill

1874–1965 · British statesman, historian and Nobel laureate in Literature

Sir Winston Churchill really was Chancellor of the Exchequer, from 1924 to 1929, which is what gives this anecdote its footing: the office is right, the period is right, and the blend of nerve and arithmetic is entirely in character. That is precisely what makes it worth checking. A story that fits its subject perfectly is the hardest kind to disprove and the easiest kind to invent — and this one has been told about a wartime Prime Minister and an unnamed African head of state as readily as about a Chancellor.

For writers & researchers

Cite this

The earliest documented instance (Chicago)

Samuelson, Doug. “Oracle: Churchill’s Theorem.” OR/MS Today, April 1991, 80. Earliest related version: Hirsch, Louis. “Cost Accounting.” Coronet 17 (March 1945): 34.

This verification page

Quotle.info. “Who really said ‘It Will Take Them Ten Years to Prove Me Wrong’?” Last verified 1 Sep 2026. https://quotle.info/who-said/it-will-take-them-ten-years-to-prove-me-wrong/

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