Feb 27, 2020 Stock market corrections, or drops of 10 percent from a high, are anxiety-inducing events. Here's what 401(k) Companies mass hiring Retailers to suspend Will you get a check? Stock market corrections: How bad can they get and how long can they last? They normally last around 4.4 months. A stock market correction is usually defined as a drop in stock prices of 10% or average, about every eight to 12 months and, on average, last about 54 days. market, strategies like swing trading rarely work for building long-term wealth. we expect that one out of every four calendar quarters will have a negative return.