It typically takes me 2-3 hours for a well written ~1500 word post. These posts get 3k / mth organic views and many subscribers to my email list, so I know they perform well.
Spending an order of magnitude more time on each post seems ridiculous to me.
The goal is to answer the question or problem as best as you can.
Typically this means not just giving a one line answer, but expanding and elaborating, going into relevant details and explaining more in-depth.
Often this extra detail will overlap with extra detail from other questions. You can link between articles, but you can also rephrase / repeat ideas.
eg. If you're searching for "Redirect in javascript" or "Simulate link in Javascript", you'll want two separate articles.
You know that the answer is the same for both, but the searcher doesn't. And as you go more in-depth explaining how `window.location` works, you'll end up covering similar material in both articles (which is not duplicate content so Google won't penalize you).
I hope you learn something from it.
I'd love to know what you think about this question, where my reasoning doesn't make sense, and any other feedback you might have.