I think the trick in the investment business is to have a long enough investment horizon that you maximize your probability of success but not so long that there's extended periods of poor performance that investors lose hope, and we found that about a two - year investment horizon achieves that balance of being able to maximize the probability of success while hopefully having only short periods of underperformance. (renaissanceinvestments.ca)
Over a ten year investment horizon there is nearly a 10 % chance of realizing a negative return - but on the bright side, the worst - case return over ten years was 1.4 % annually, a loss of around 15 % over the period. (money.stackexchange.com)
Downside: brokerage commissions and / or up to 2 year investment horizon with little investment loss. (longtermvalue.wordpress.com)