When I publish or modify a solicitation does it automatically appear on VSS for vendors to see, or is there a delay time?

When you enter a solicitation in CORE, it will be processed via a batch process that occurs every hour on the half hour from 6:30 a.m. through 5:30p.m. There will be a slight lag between when you first post a solicitation in CORE and when it will appear in Vendor Self Service (VSS).