Imagine you had 72 hours before everything collapses. How would you spend that time? Would you stockpile supplies? Would you focus on warning as many people as possible? Would you try to preserve knowledge, like books, hard drives, download internet archives, etc.? Would you collect music or history?
Faraday. 😋
It would be catastrophic around densly populated areas, and be easier but still hard for rural residents. It would be a while before the lights came back on.