Looking only at these examples of hyperinflation, there are two obvious answers. Two to three years, or as long as the idiot stays in charge (Argentina and Zimbabwe being the prime example).
Not listed in that article is Mexico, and its whopping 150% inflation in 1987. Now this is every bit as dangerous to savers as it is to spenders. If your life savings are in a bank earning 4% interest while the inflation is at 150% interest, you will lose 75% of the VALUE of your nest egg over the course of a year. Yes the amount of money in the bank will still go up, but it will only buy a quarter of what it used to due to rising costs. What happened in Mexico was hyperinflation, however this isn't shown by the numbers here because of the transition from the peso to the new peso in 1982. If you adjust solely against a 1970 peso the Mexican inflation crisis was hyperinflation.
Moderate inflation is something that politicians like. After all inflation is the only tax that doesn't have to be approved by Congress (by making things cost more people have to spend more and therefore more taxes are gathered).
So, if you are worried about hyperinflation, either things will be better in about two years, or things will last a lot longer (Mexico, Zimbabwe, Argentina). Since it is impossible to plan on an infinite period of crisis/disaster, it makes a lot of sense to plan for a two year currency crisis.
I am not a fan of George Soros, but my opinion does not change the fact that the man knows how to work markets to profit himself. So when the man who brought down the Bank of England predicts that things will get worse, I listen.
“I think the dollar is now under question and I think the system will need to be reformed, so that the United States will be subject to the same discipline as is imposed on other countries,” said Soros, whose famous bet against the British pound earned his Quantum Fund $1 billion in 1992. “Being the main issuer of international currency, we have been exempt and we have abused that because we have effectively consumed 6.5 percent more than we have produced. That is now coming to an end.”
Of course Soros is predicting that it won't just be an isolated country here and there with financial problems, but the whole ball of wax melting down. And like I wrote before, I am not a fan of Soros. I think the man is both vile and evil, and unfortunately I think he is likely right.