How many articles must write a blogger on day?

How many articles must write a blogger on day to be strong in Google? - A question that a friend asked me, a beginner in on-line.
I replied that the internet is a real industry, where big fish eats little ones. So to be great it takes many. "And that would be?" - I asked him. "Well, the blogger must have many articles written online, friends offering links and comments, and some SEO".
He understood something, anything, but asked: "How should I write a day?" "Much" - I replied. A lot. The answer did not like him, but it depends on him what he will do or not with one who is called Internet opportunity.