Control Compliance Suite

Does anyone know Symantecs update schedule for CCS VM vunlnerabilites? eg weekly on tuesdays, 1st of each month or just whenever they have updates

Thank you,

This is what it lists in CCS VM user guide (pg 32)

Symantec Control Compliance Suite Vulnerability Manager keeps the database current through a subscription service that maintains and updates vulnerability definitions and links. Symantec Control Compliance Suite Vulnerability Manager contacts this service for new information every six hours.