One of the most pervasive and incorrect ideas that holds people back professionally is that the value of a product or service is determined by the amount of work that went into making it (the Labour Theory of Value).
There is a similar fallacy about blogging that shows up in the fear of short blog posts.
The value of a blog post has nothing to do with its length. Even though most people know this, when they start blogging they feel afraid to write short blog poss.
Your blog is a medium to communicate ideas. The less time and work it takes to communicate those ideas the better.