The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Share | Related Content What Can a Million Dollars Buy You? $1 million in a diversified portfolio could help finance part of your retirement. Asset Allocation Consider how your assets are allocated and if that allocation is consistent with your time frame and risk tolerance. 5 Smart Investing Strategies Getting what you want out of your money may require the right game plan.