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 Changing Unhealthy Behaviors Five phases to changing unhealthy behaviors. Understanding Homeowners Insurance Purchasing homeowners insurance is critical for protecting your home. What Can a Million Dollars Buy You? $1 million in a diversified portfolio could help finance part of your retirement.