The frequency of updates depends on what you are doing with your blog. People are different when it comes to varying time constraints and writing abilities. Updating at least once a week should be sufficient for small general blogs. If you go less than that, it would be hard to maintain your readers’ interest. However, it is different, for example, if you run a news or technology blog. It would be good to post new contents on a daily basis or even several times a day for the blog to garner the interest desired.