10 years. Moreover, the most difficult time will come in 3 years. This is similar to the Great Depression. But there is a difference from that time - the whole world will be depressed without exception. Well, China has just suffered the least, but the dominant China is also not a pleasant event.
Yes, everything is much more interconnected in today's world than it was in times of the Great Depression. No doubt that every single country will be affected. But take into account to what extent technologies in all fields have developed since then. My point is that although all the economies will suffer from the pandemic, the damage will be minimized, and in the end no country will suffer the way the US, and some other countries, suffered during the Great Depression.