18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Have A Question About This Topic? Address Thank you! Oops! Related Contents Rightsizing for Retirement What does your home really cost? Social Security Benefits: How Much Will I Receive Calculating your potential Social Security benefit is a three-step process. Saving for Retirement This calculator can help you estimate how much you may need to save for retirement.