Although the overall collapse in REAL GDP was relatively shallow (-3.1% from peak to trough in real terms and -0.4% in nominal terms) and took place over two years (2008 to 2009), the recovery in the seven years since then has been very anemic. The economy reached parity with its pre-recession peak GDP in nominal terms in 2010, only three years after the Great Recession started in December 2007. In real terms, it took an additional year, by 2011, to reach parity with its pre-recession peak. By the 3rd Qtr of 2016, the US economy is only 29.35% larger, in nominal terms, than the bottom in 2009, averaging only 3.75% growth every year since the Great Recession bottomed out. In real terms, the US economy is only 15.95% larger than the bottom in 2009, averaging only 2.14% growth every year since 2009.
The overall economic contraction during the Great Depression was much more severe (-46% in nominal terms and -27% in real terms from peak to trough) and took much longer (four years from 1930 to 1933). In real terms, economic parity with its pre-depression peak was only reached in 1936, seven years after the start of the Great Depression. Despite the severity and depth of the economic contraction, it only took three years after the 1933 bottom for the US economy to reach parity (in real terms) with pre-depression peak in 1929. Recovery, in terms of economic growth rates, was a lot more robust, averaging 10.9% annually during this period. In the four years since the US economy bottomed out in 1933, the US economy was 43.5% larger than the bottom in 1933, averaging 9.44% growth per year every year. In nominal terms, the US economy only recovered its pre-depression peak only sometime in 1941, when WWII spending began in earnest.
Source: www.worldbank.org, www.bea.gov, Reinhart and Rogoff, "This Time is Different"