A lot of novelist use dictation software so that they can write up to 5000 words an hour. There's actually a book called 5K words an hour (or something like that) that teaches you how to do this.
Outlining is important if you write like this, though.

No. When you understand the discipline of writing, and have stories to tell, you can write as fast as you can type For me it's 90+ words/minute.
When you think about it, one can write 10 pages/day double-spaced, 12 or Ariel type for 15 days and write a novella of 40,000 words.
It's a matter of discipline and love of storytelling.
Blessings,
Becky D.