Plenty of tenured engineers on this site. What’s largest outage of this magnitude, you recall? I’m at around 6.5 hours.
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@OP Early in the 4G LTE era circa 2011 VZW had an outage that lasted over 12 hours. My memory is hazy but I remember sitting on a conference call for so long that my back was hurting by the end.
I think it only impacted the Alcatel-Lucent markets (about half the nation).