There’s no right or wrong answer here. 800 words is a good base line but it really depends on the type of blog and its aim. Though, we will say that the longer a blog is, the more information it offers users, and the more educational it is. Our advice? Create an outline for your blog, define the story you want to tell, research the key questions your audience has on the topic, then write as many words as needed to adequately answer those questions and get your point across.
It’s also worth researching other blogs that cover similar topics and seeing how long they are. You’ll want to reach a similar word count – though never add words for the sake of it! You still want your language to be clear and concise. Fluff and a target word count are not the same thing.