The average duration of unemployment this recession has been 31 weeks, and the percentage unemployed more than six months is far and away the highest since the Great Depression. Four percent of the labor force has been unemployed for more than six months. The previous post-Great Depression peak (2.5% of the labor force), was in the 1983-1984 recession.
The percentage of workers permanently laid off is also at a post-Great Depression peak.
This makes it unlikely that this recession will follow the pattern of some other post-Great Depression slumps where deep job losses were followed by rapid job recoveries. "Getting these people back to work will require something more than companies returning to their pre-recession profitability. It will require new companies, new industries, new areas to invest. [from the link above.]"