[optimussupreme]

Most likely for 0 days, then no one would be able to for decades or centuries, because there will be other much more important priorities. There will be unaffected countries, but they won't do much because supply chain for advanced stuff intertwines the whole world. People would reuse again and again scrap parts and old computers, z80 cpu would outlive everything else. There will be all sorts of flee markets for things like that. I grown up in post soviet crash, I've seen a lot of stuff, local postapocalypse basically, and how people, economy, society adapt and behave in such circumstances.