One of its members was Thomas Jefferson, a lawyer from Virginia. He had been a leader in Virginia, and Virginia had elected him to the Continental Congress. The others on the committee were too busy with the revolution to work on the declaration, so Jefferson wrote it alone. He finished the document in a week.
The time frame is in weeks, so it shows the average bull market cycle is 155 weeks or about 39 months. The average bear market is about 17 months, which actually matches the most recent bear market from October 2007 to March 2009 (17 months). A full market cycle is 56 months.
The Almanac says that the shortest bull market in the past 100 years lasted just 61 days during the summer of 1932 yet still saw the Dow bounce 94%! Those are of course the extremes, but the average bull market of the past century has lasted 755 days and delivered an 85% gain. The current bull run is now four years old and up about 120%, making it significantly above average by both measures.