I spend 3-5 minutes thinking before writing - I do it to support a good argument even though many of them don't consider it a quality post. Thinking before writing is recommended because by doing so you have tried to convey something that can at least be justified by your own thoughts regardless of your knowledge or other people's judgment.

Writing something long does not mean it has quality – actually something quality is not just a long piece of writing but really depends on the information you want to convey and how useful your post is. All qualities are rated by other users - you, me and all other users just write and let them judge it.
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This forum teaches the quality of writing and not the quantity. If there are still those who pursue quantity without quality because they have a Signature task, of course it is the Manager's job to provide an evaluation to its members. But not all Signature supporters do that. In fact, I have to think 10-20 minutes to find supporting fact data. Because usually the argument will be better if it has a clear data source. I also agree that quality does not have to be long, but sometimes it needs a long explanation to provide a more detailed explanation because the understanding of members of each forum is very different.