According to Prof. Jeremy Siegel's analysis of total real return since 1802, all an investor needs do is hold for 17 years and they will never lose money in the market.
I had accordingly applied that observation to BSE Sensex from January 1991. Monthly closing is based on average of the Daily close. Here is the chart :
For benefits of all , I am sharing a selected low in Sensex along with high at the end of 17th year in the Table :
In 122 of monthly_Up moves, Sensex gained average of 309.69 & in 82 of monthly_Down moves, Sensex lost average of (237.23) points ; thereby in 164 months Sensex gained a net 5941.68 & 40 months of the Step_Sum (Monthly) Sensex 12387.51 . As such, a gain of 18,329.19 over the starting value of 996.45 in 17 years of up & down in SENSEX gave a mammoth growth of 1839%
With reference to low of 2918 (September 2001) & 3033 (May 2003), we may look forward to a high in September 2018 & May 2020 .