I myself take my time to consider improving hubs that are almost ready and take the time to add proper images to them. If possible I create my own images. I could publish more than 3 hubs today but wouldn't guarantee good quality and a complete research.
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That's what I think, but it is not the only answer for this question. I like to know different thoughts of people or get an advice on how to write multiple hubs without less quality. You never know if someone will surprise you with a good answer.