I can complete three chapters of around 4k words each a day, depending on my mood. Last time, I hit my largest single day word count @15k words.
However, this is the maximum. A chapter of 4k words for me is typically done within a day, and a 60k word average manuscript (divided into 16-20 chapters) is usually done in a month.
Do take note that I edit as I write along, hence the whole day time allowance.
At my lowest, I can only throw in 100 words a day...especially if I'm in no mood to write and is trying to 'warm' up.