How often do you query new job leads?

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I have a couple of regular gigs, and then I have a number of assignments that are short-term. I like to keep work steady, so I am in the habit of sending out queries for job leads every business day (and sometimes on the weekends). This is the best way for me to keep my freelance writing business steady. How often do you send out query letters to new job leads? Do you feel like you need to do this daily in order to keep your freelance writing business steady?