There's no one answer to this. It depends entirely on the topic and the skill of the writer. Depending on those two things, you could have anywhere from none to thousands of page views per day.
An awesomely written article on a subject that no one is searching for will get no traffic. A mediocre article on a subject that everyone is searching for will get decent traffic. An excellent article, properly promoted and on a subject of high interest, will get lots of traffic.