the # of posts doesnt matter...what matters in the end is the quality of content...i usually prefer articles to small posts in my blog!
I think posting 1 articles per day is enough. but always be sure that your content will be quality content and not crap or garbage
Sometimes I do one per day, then another day I might do 5 or 6 and then other days I might do none at all. It all depends on what you blog is about I think
I can almost guarantee you that anyone posting 5-6 times a day (unless they are following some industry like the Stock or Money Markets and getting first hand updated information) after a while is posting keyword stuffed garbage. Even the largest of financial companies don't keep up that pace on the company blog 365 days a year, it's ridiculous, and those that do, like news and sports outlets, have scores of writers and contributors who themselves only write once a day, but when combined is multiple posts a day. If you have 2, 3, 4 or 5 post of relevant, compelling, entertaining and informative information that you can post everyday and keep up that pace for the life of your blog, then I say go for it. But if you don't...you will burn out in a month Number of posts per day is irrelevant. Quality of your posts is what is most important.