According to a recent study of the electronic logs of 3 large practices,

... primary care physicians received a mean of 76.9.electronic notifications each day, while specialists received a mean of only 29.1 notifications per day.

Source: "The Burden of Inbox Notifications in Commercial Electronic Health Records," JAMA Internal Medicine, March 14, 2016, http://archinte.jamanetwork.com/article.aspx?articleid=2500026