I used to try to write on 750words.com every day. For those that don't know, it's a site that encourages daily writing. The participants strive to write at least 750 words. After you submit your writing, you will see how many times certain words were used, as well as your speed.
One day, I decided to try to write 750 words as quickly as possible. My result was 10 minutes. Most of it was jibberish. I spoke in sentences, but it wasn't anything that anybody would want to read. I was just happy to know that, if I was to push myself, I could write 75 words per minute.