In the US, the power grid is split in 3: East, West, and Texas. For all three to go down would probably mean terrorism or war, so the military response would be relatively quick. If we ignore that and restrict response to mean relief for citizens, we have a recent record of federal response times for a Texas crisis: 4 days. It took two days for Texas to declare an emergency and two more days for the federal government to declare one on the federal level and send additional help. https://en.wikipedia.org/wiki/2021_Texas_power_crisis
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