Context: After a gradual 5-year recovery to an intraday high of 2,239.51 on October 31, 2007, the highest reached since February 16, 2001, the index corrected below the 2,000 level in early 2008 amid the Late-2000s recession, the United States housing bubble and the Financial crisis of 2007-2010. Panic focusing on the failure of the investment banking industry culminated in a loss of more than 10% on September 29, 2008, subsequently plunging the index firmly into bear market territory. The NASDAQ-100, with much of the broader market, experienced a Limit down open on October 24 and reached a 6-year intraday low of 1,018 on November 20, 2008.

Question: How many months passed between the index high and its 6-year intraday low?

Answer:
13