Flashback: 10-19-1987
Black Monday is the name commonly given to the global, sudden, severe, and largely unexpected stock market crash on October 19, 1987.
Dow Jones Industrial Average falls 508 points (22.6%), making it the largest one-day drop by percentage in the index's history.
https://en.wikipedia.org/wiki/Black_Monday_(1987)
On the New York Stock Exchange (NYSE), one type of trading curb is referred to as a "circuit breaker". These limits were put in place beginning in January 1988 (weeks after Black Monday occurred in 1987) in order to reduce market volatility and massive panic sell-offs, giving traders time to reconsider their transactions.
At the start of each day, the NYSE sets three circuit breaker levels at levels of 7% (Level 1), 13% (Level 2) and 20% (Level 3). These thresholds are the percentage drops in value that the S&P 500 Index would have to suffer in order for a trading halt to occur. Base price levels for which these thresholds will be applied are calculated daily based on the preceding trading day's closing value of the S&P 500. Depending on the point drop that happens and the time of day when it happens, different actions occur automatically: Level 1 and Level 2 declines result in a 15-minute trading halt unless they occur after 3:25pm, when no trading halts apply. A Level 3 decline results in trading being suspended for the remainder of the day.
https://en.wikipedia.org/wiki/Trading_curb
From 10-19-1987 to 06-13-2022 = 12,656 days
34 years (3+4=7),
7 months
25 days (2+5=7)
https://www.timeanddate.com/date/durationresult.html?m1=10&d1=19&y1=1987&m2=6&d2=13&y2=2022