Someone left me a comment on the So You Think The Market Is Bad Now? It Went Down 89% Between 1929 And 1932 post asking for some additional data for the chart. Here is some of that data, as you can see it took 25 years to close above 400 again. Just imagine if this happens now, a lot of people will not be able to retire, the only problem is that there is not an abundance of jobs either, as a matter of fact there is a shortage.
Click on the chart for a larger version