How much should you write to have a successful career as a writer?

According to Neil Gaiman? You have 1 million words of absolute garbage you need to expel before you can get to the good stuff.

In my experience, that’s pretty accurate. You should write a lot. Nobody can really teach writing in a way that supplants the need for practice.

If you’re starting out, try to get into the habit of writing every day. Sit down for 15 minutes a day and put at least one sentence on the page. Doesn’t matter what you write. All that matters is you’re writing.