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? Address Thank you! Oops! Related Contents 18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Inflation - Back to the Future Even low inflation rates over an extended period of time can impact your finances in retirement. Investment Strategies for Retirement Investment tools and strategies that can enable you to pursue your retirement goals.