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The only "reasonable" amount is the amount you can publish without getting too much addicted. I usually try at least one article a day. Some do fine with just a couple each week, but that's because they already have a big following. My advice is to publish when you have a content you really feel motivated and enthusiastic about.

Thank you, makes sense. I noticed there are photo challenges, but I cannot find the rules or topics, do you know anything?

usually, they are announced through the tag "steemitphotochallenge", check it out every day and you should find your answers :)

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