How long is this GPU and CPU shortage going to last?

Incredibly stupid question

every chip fab in the world is running 24/7/365.  the problem is that cryptominers are willing to pay high prices to expand their number of machines -- and thus, they are buying up the available supply.  If/when crypto currencies start falling in price, demand will lessen.  but it takes 3 years plus to build another fab plant -- and that's in countries that welcome such factories and use government muscle to make things happen.  [In america, due to required environmental reviews and possible court delays, the estimate is 7 years to build a fab, perhaps 10]

Doubtless because the factories making these components have been hit by Covid, like the rest of industry.  It'll improve as and when they get back to full production and catch up.

Do you recall when the supply of, I think it was, hard drives became very slow because plants making them were destroyed by tsunamis?

Don't expect to see a massive change until late this year to early next year. This isn't just AMD and nVidia, but issues at the fabs (such as global foundries) that make the CPU dies. This is affecting *far* more than just gamers, or even PCs in general - even auto makers have suspended or slowed down production because the chips needed for the computers that control so much of a modern car are not available - and while production ramps up, they (and other industries that buy *far* more chips than PC gamers) are going to get priority.  I started picking up parts last year to update a PC - I don't expect to actually have components to go in the case 'til 2022 at this point (at anything close to MSRP.)