Updated (Nov 4): This blog post has been updated to reflect that the test will last approximately 30 seconds.
So here's an excerpt from my first blog post, with details about the test:
What will people hear and see during the test?
On November 9, the public will hear a message indicating that “This is a test.” The audio message will be the same for both radio and television. However, the image on the screen and the text/crawl at the top of television screen may not be the same for all viewers. When the Emergency Alert System test is over, regular programming will resume.
How long will the test last?
We anticipate that the test will last approximately 30 seconds.
Since we first announced the test, we've been actively engaged with our partners at the Federal Communications Commission, our state, tribal, territorial and local partners, the broadcast community, and other key stakeholders to make sure the word gets out about the upcoming test, and we'll continue to spread the word in the coming weeks. I encourage you to visit the FCC website for more information about the test, including answers to some frequently asked questions.