When I say words per day, I mean how many NEW words written (a new short story, a new chapter for a novel, a new article, etc), I do not count the words added during the editing and revision process.
Because writing is my full time job, I have the entire day devoted to it, plus I'm also a senior/elderly/retired so there are no children underfoot, no work or school in the way... in other words I have a lot more time now to write then I did when I started writing 4 decades ago. And that makes a big difference in my word counts.
When I was first getting started I used to struggle to reach 700 words a day, which was a combination of too many things in the way (school, work, family) and both not enough time, skill or practice at writing to yet be speed typing. (I took 4 semesters of secretarial typing and achieved a typing speed of 175 words per minute while in school, but rarely go faster then 91 words per minute since school (5,000 words per hour); I don't recommend speed typing without training as you can do serious damage to your wrist and finger muscles without doing proper warm up exercises first... think of it as the same as doing intensive gym work and needing to warm up first and then learn to do it in small steps over time. It took about 2 years of daily practice to learn how to speed type.)
That said, I currently average 17,000 words a day. Which is quite a big difference from my early days 40 years ago and struggling to reach 700 a day. This change is largely due to having more free time and now having better skill/training in the act of typing.
I strive to each day write 2 to 3 articles of 2,000 words each (6,000 words total), 1 new short story (4,000 to 7,000 words), and 1 to 3 new chapters of whatever current novel I'm working on.
I write in 3 four hour sessions per day, each session including a 15 minute break every 45 minutes; with a 1 to 2 hour break between each session. I then do a 4th session in the evening which is editing whatever I wrote that day.
Because I work in a sort of assembly line method, I'm also publishing 2 to 3 articles daily, 2 to 3 short stories weekly, and 3 to 4 novels a year. I publish around 3 million words a year. I'm also obviously doing this as a full time career, thus the rather grueling work schedule I have.
This often leads people to believe that I put less work into my novels then I do, because they falsely assume the novel I'm working on today, is the one I'll publish tomorrow. When in fact, each of my novels goes through, about 12 edits, and a minimum of 7 revisions, a process that takes an average of 4 years from the time I write the 1st draft to the time that draft is published.
I am physically typing about 4o hours a week, and editing about another 40 hours a week. I'm working 80 hour weeks most weeks, with no time off, no vacations. Just continually writing. I also have Agoraphobia and so, I don't leave my room very often, and have at times gone several years between going outside, the longest I went without setting foot out of my driveway was 15 years; VERY severe agoraphobia issue here contributing to my high word count out put, I also have PTSD, OCD, Kanner's Syndrome, and Schizoaffective Personality Disorder, which also contributes to my obsessively writing as much as I do, literal on everything... my car and my motorhome have quotes painted all over them, and when I had a house, it was written on - every inch of it - walls, floors, ceilings, inside and outside - if I don't have paper to write on I just write on whatever's there. usually to block out whatever phobia is bothering me that day. There are very serious anxiety issues behind why I write like I do.
And I do dress like that every day. I CosPlay 24/7 I have since 1987
There was team of psychologists here from Australia a few years ago. They wanted to study me as part of their theory that obsessive high out put writing is a symptom of schizophrenia. You could probably guess, why they picked me to be one of the authors they choose to study for their study.
Don't look at my high word counts and try to achieve them, because without serious issues in surviving horrific childhood abuse that mentally cripples you, you'll never be able to write word counts like I do.
When my relatives worried I'd write myself to death (after I wrote steady for 5 days, none stop, without stopping to eat or sleep and only stopped because I passed out) my psychiatrist told them: "Nope, she's fine, let her write, it's the only way she can face the world. It'll be worse if you make her stop writing. I've dealt with Schizophrenia patients before. This is what they do. This is how they cope with trauma."
A lot of writers over the years have written to me and asked how to be a high out put prolific writer, claiming they want to be like me.... you don't. Believe you don't. I literally write nearly every waking minute of my life, to keep from killing myself, and every one who knows me personally knows that and they know what happened to my family, to cause this, why I'm alone now, and why I completely shut out society and do nothing but write about and dress like Elves now.