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.

how long is the "test suppose to be." I am turning cell phone off at work but have to have on after work hours.

I had already planned to unplug, turn off, and put my phone in my closed pressure cooker (Faraday cage). Now, after reading this, I will leave everything off or in the cage all the 4th. I'm wondering how many others can unplug from their precious electronic addiction for 24 hours??