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If there are any "rules" at all, they are domain dependent. Unlike in printed chapter lengths, counting words in blog is simple, isn't it? Just look at some blogs comparable to yours, and emulate...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/4518 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If there are any "rules" at all, they are domain dependent. Unlike in [printed chapter lengths](https://writers.stackexchange.com/questions/41/what-is-a-normal-length-for-a-chapter), counting words in blog is simple, isn't it? Just look at some blogs comparable to yours, and emulate them.