The length of a recession can vary depending on a number of factors, such as the severity of the economic downturn and the effectiveness of government and monetary policies. In general, recessions tend to last anywhere from a few months to several years. The average length of a recession in the United States since World War II has been about 11 months. However, some recessions have been much shorter, while others have lasted for several years. It is difficult to predict exactly how long a recession will last, and it is important for individuals and businesses to carefully plan and manage their finances during this time.