I’ve read it should last about an hour in total. That said if it anything like the emergency broadcast system it’s likely only to last less than a minute.

I have to think that this is proof of concept to prepare for the “push” of whatever accessibility update/patch/exploit they are eventually desiring to implement.

I have 100+ PCs and a dozen servers. There is simply no way I can convince my employer to shut down for the afternoon. Home my systems and routers will be down, unplugged, and my phones will be in my unplugged microwave.