The timing varies for me on my blog posts as it depends on how much I run across issues. It is a technical tips blog, and I tend to post how to fix things that I had to fix so that I do not have to figure it out again when it inevitably crops up again.
I try to post a minimum of two posts per month. Sometimes I have three or four posts in a row, same day or successive days. I think I have at most seven posts in a month.
I truly believe your content should dictate your posting frequency. If you are a general news site and not posting throughout the day, then you are not posting enough articles. If your blog's purpose is news about your company, you may only have one or two posts a month, and perhaps have some months with no news at all.