I definitely check emails and calls multiple times in a day. Checking job boards is a nearly daily task. However, I don't do that for every company I am signed up for. That would be significantly time consuming and not worth it. I have groupings of companies for that. The first group of bookmarks is about 15 companies. These have lots of jobs in my area that I want to do. I use the Firefox feature "Open All In Tabs" and viola! I have those 15 opened up to the log on page. I have other groupings that are of less importance to me. Those I open up less often. Sometimes I check a job board for a particular shop or perhaps to see what a particular company has that allows self-assignment.
As you gain experience your personal preferences will shape how often you search job boards and which ones, too.
Happily shopping Rhode Island and nearby Massachusetts and Connecticut