Since 1860, US interest rates has shown the tendency to bottom every 50 years. From lows to highs, the up trend lasted for about 30/35 years. Within this long term bull trends, the market has bottomed every 4-5 years and topped every 3-5 years. The bull move lasted for about 30%-50% from lows to highs. The bearish corrections continued for about 15%-25% from highs to lows.