For federal contractors, all employment openings must be listed "except executive and senior management, those positions that will be filled from within the contractor's organization, and positions lasting three days or less." Evergreen reqs often lead to issues in an audit, so a good practice with high volume is typically to run analyses frequently, perhaps quarterly, to ensure there are no areas of impact. Hope this helps.
You can use this OFCCP audit checklist to ensure you're doing what is required to maintain OFCCP's regulations including VEVRAA, Section 503, and EO 11246. Or request a demo to streamline your compliance and recruiting efforts.