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 Retirement Traps to Avoid Beware of these traps that could upend your retirement. First Things First These four essential steps can help to increase your financial confidence for the year ahead. How to Get Your Finances Ready for Retirement Everyone has a vision of their retirement in their heads.