If you want to lead a full-time writing career in your full-time life, consider the happy mathematics of writing books.
Writers talk about books taking six months or a year. Or indeed years. And of course any profession will fill the entire time you give it, including every hour of the day, if you allow it to schedule you instead of the other way around.
If you step back and look at the time it takes you to write, rather than the time it takes a book to get itself written, you find that you can write about a thousand to fifteen hundred words an hour, so long as you know what you’re going to write.
You’re going to be outlining, revising, polishing and planning your marketing strategies during the week, but unlike drafting, these can easily be done in smaller time frames.
Posit that those fifteen hundred words are based on a good outline, then they will become part of your book. If you write twice a week for about an hour, then, you have three thousand words. (Mind you, if you are happy to take five hours to compose a perfect paragraph, then carry on and don’t mind me.) If you have three thousand words a week, and you use the best part of those words, then you have two short novels or one long novel a year.
There’s more to a writing career than writing your story, of course, but that is a necessary basic: having fantastic books to build your career upon.