How long did it take Robert Louis Stevenson to write DrJekyll and Mr Hyde?

It's impossible to say exactly how long it took Robert Louis Stevenson to write *The Strange Case of Dr Jekyll and Mr Hyde* because he didn't keep a detailed record of his writing process. However, we can estimate a timeframe based on available information.

* The story was conceived in 1885: Stevenson had a dream in which he saw a man transforming into a monstrous beast. He immediately jotted down the idea, and his wife Fanny encouraged him to develop it into a story.

* It was written quickly: Stevenson was known for working quickly, and he often wrote in bursts of intense creative energy. He started writing the story in September 1885 and completed the first draft by the end of October.

* Revisions and publication: He then revised the manuscript, working with his editor and publisher. The story was published in January 1886.

Therefore, we can estimate that it took Stevenson around three months to conceive, write, and revise *Dr Jekyll and Mr Hyde*. This timeframe, however, includes the time spent revising and working with editors, so the actual time spent writing the initial draft might have been even shorter.