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. Related Content Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals. The Pre-Retirement Checklist This checklist can give you a quick snapshot of how prepared you are. Gun Ownership and Your Homeowners Policy Gun owners need to make sure that their homeowners policy covers the full value of their firearm(s) as personal liability.