Post as often as you can. People who become fans of your blog will likely be looking for a new post every few days. Some will only look once a week. If you want to keep your blog fresh and interesting, you should post often. Posting often is something that takes very little time, because your entries should stay short and sweet. It is a way however to keep things new and exciting for your biggest fans. They will be waiting for your new posts and will continue logging on as long as you provide them with new information.

Sources:

The Amateur Blogger - Tips For Newbies to Succeed Online

Easy Tips to Make Your Blog Popular