The US markets have had two major corrections since 2009,

it took the markets a number of months of retesting lows before they resumed their uptrends:

2010 = 3 months of backing-and-filling after the correction

2011 = 4 months of retesting/backing-and-filling after the correction

2015 = We are currently at the end of the second month since the end of the last correction was where the market found its low on August 24