We tend to picture great books as slow work, built over years of revision. Some of them weren’t. A handful of well known novels and novellas came together in a few weeks, or even a few days, usually under pressure.
The details below come from the authors’ own accounts and long standing literary history. Where a claim rests on the author’s recollection, the text says so.
Rasselas by Samuel Johnson

Samuel Johnson published this philosophical tale in 1759. According to the long standing account, he wrote it in the evenings of about one week. His mother had just died, and he needed money to pay for her funeral and settle her debts.
The story follows a prince of Abyssinia who leaves his sheltered valley to search for a happy life. Johnson’s answer is a quiet one, that no choice of life guarantees contentment. The speed fits the circumstances, though the book reads as anything but rushed.
The Sorrows of Young Werther by Johann Wolfgang von Goethe

Goethe’s 1774 novel is told through letters from a sensitive young man whose unrequited love ends in tragedy. Goethe later recalled writing it in roughly four weeks, drawing on his own painful attachments. That timeline comes from his recollections, so it’s best read as his own account.
The book made him famous across Europe almost at once. It became a landmark of the Sturm und Drang movement, and it’s still read as an early portrait of intense youthful feeling.
Strange Case of Dr Jekyll and Mr Hyde by Robert Louis Stevenson

Stevenson wrote this novella in 1885 while living in Bournemouth, England. By the traditional account, he produced a first draft in about three days. His wife Fanny criticized it, he burned the draft, and he rewrote it in a similar stretch of time.
It came out in January 1886 and sold strongly. The story of a respectable doctor and his violent double gave English a lasting shorthand for split personality.
The Gambler by Fyodor Dostoevsky

Dostoevsky was in financial trouble in 1866 and had signed a harsh contract with the publisher Fyodor Stellovsky. If he missed the deadline, Stellovsky would gain the rights to his future works. With little time left, Dostoevsky hired a young stenographer, Anna Snitkina, and dictated the novel to her.
They finished in twenty six days, and he delivered on time. He and Anna married the following year. The novel draws on his own struggles with roulette.
On the Road by Jack Kerouac

In April 1951, Kerouac typed the first full version of his road novel on a continuous scroll of taped together paper. He’s widely reported to have finished it in about three weeks. The book did not appear until 1957, after years of revision and rejection.
The original scroll later became a famous artifact. It was sold at auction in 2001 for a little over two million dollars, and it has toured museums and libraries since.
Fahrenheit 451 by Ray Bradbury

Bradbury didn’t have a quiet place to write, and he didn’t own a typewriter. He rented one in the basement of the UCLA library, paying by the half hour. He wrote the shorter story that became the novel in about nine days.
He later expanded it, and the full book was published in 1953. It imagines a future where firemen burn books, and it remains a staple of school reading lists.
A Clockwork Orange by Anthony Burgess

Burgess published this dystopian novel in 1962. He has been reported as saying he wrote it in about three weeks, so the timing rests partly on his own recollection. The book is narrated in Nadsat, an invented teenage slang drawing heavily on Russian.
Its fame grew after Stanley Kubrick’s 1971 film adaptation. Burgess himself had mixed feelings about the film’s influence on how readers saw his book.
The Alchemist by Paulo Coelho

Coelho has said he wrote this fable in about two weeks, in 1987 or 1988, so again the claim comes from the author. It was first published in Brazil in 1988 and found only a small audience at first. A later reissue and international translations turned it into a worldwide bestseller.
The story follows a shepherd boy named Santiago who travels toward Egypt in search of treasure. It has since been translated into dozens of languages and is among the best selling books by a living author.