If my memory serves, the DOW recovered 100% of that "crash" the very next day.
It took until January 1989 before it hit the value of the day before the crash and August 1989 to hit the precrash peak.
Here's the page I used. http://bigcharts.marketwatch.com/intchart/frames/frames.asp?symb=djia&time=20&freq=2
Select Custom under time frame and you can select the exact dates to look at.