The free job boards will will your job post for 120 days. After the 120 days, the job will be removed.
The job boards read off the job's creation date within TriNet Hire. Therefore, you will need to clone the job in order for a new creation date to be generated (Cloning a Job Post). After you have clone the job, the clone job post will appear on the free job boards within 24-48 hours. Please move the original job post to the "Closed" status.