My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Share | Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content 18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? How Women Make it Happen Women in financial services are some of the most progressive women in the world. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.