Final answer:
A facility licensed by the California State Board of Pharmacy should join the board's e-mail notification list as soon as possible to ensure regulatory compliance and receive important updates, although the specific timeframe is not provided in the reference given.
Step-by-step explanation:
The California State Board of Pharmacy requires facilities licensed by the board to join its e-mail notification list promptly, as part of regulatory compliance to stay informed about important updates and changes. Unfortunately, the precise timeframe within which a facility must join the e-mail notification list is not provided within the scope of the reference given. Nonetheless, it is generally expected that facilities should subscribe to the list as soon as they are licensed or become aware of the requirement to ensure compliance and receive timely updates on matters such as adverse drug event reporting as outlined by the FDA and through programs like MedWatch.