Writing is a career, right? That’s what people often say. Sitting down at a computer to force out a series of words/a bunch of sentences/a collection of paragraphs/a succession of chapters/an entire novel is pretty much the same as going into an office, or any other work site, and doing whatever your job is supposed to be.
To some degree, that’s right. Any serious writer definitely needs to view the time they spend writing as equivalent to any other substantive money-making activity, rather than some sort of frivolous, spare time activity. How else are you going to be able to make yourself into a success?