Posting more than once a day doesn't get more people to read your blog, nor does it get you more comments.
You might think you would get more comments if you write more posts. In reality most bloggers and blog-readers don't stay online all day. They come and go in starts and spurts. Once a day or every other day for posts you really want people to read is all you need.
Unless you write reviews of blogs.
Then it can be every day... and twice on Fridays.
But it still won't get us more comments.