Ian Fleming wrote 2000 words per day and was able to produce a v1 of a novel in 6 weeks. This appeared on HN a couple of weeks ago:

https://lithub.com/ian-fleming-explains-how-to-write-a-thril...

I read Casino Royale (the first Bond installment) for the first time last week; it's quite good and fast-paced. The chapters follow the 2000 words rule quite closely, and it's working.