Monkeys Writing Shakespeare (or Austen...)

Following is the opening of Jane Austen's Pride and Prejudice. But with a twist... Every so often, a word will be replaced with another word of the same part of speech.

How long will it take the random word changes to repeat the original text?

This site uses a JavaScript app that chooses a random word in the text and searches a list of the most common words in the English language classified by part of speech. If the word is found in one of the lists, it is replaced by another word in the list. Then another random word is chosen, ad infinitum. Or ad tabbus closium. :)