You normally see organic applicant traffic from job boards within 24-48 hours of posting a new position.
Your hiring system provides a direct XML feed to several job boards, including:
When a job is posted, it is considered live and will be sent from the hiring system through our XML feed to the Job Boards and will appear on your system's Career Site. Applicants can apply on your Careers Site immediately, but the job boards must conduct a refresh from their end once every 24-hour cycle. As soon as the job boards initiate a refresh, your postings become visible in their organic search results. Therefore, you would see organic applicant traffic from these job boards within 24-48 hours of posting a new position.
Although your position may not yet be visible on the job boards, you can immediately start directing applicants to apply via your Career Site once you have posted a job.