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? Name Email Address Question Thank you! Oops! Related Contents Tuning Your Social Security Benefit When should you take your Social Security benefit? Your Changing Definition of Risk in Retirement A change in your mindset during retirement may drive changes to your portfolio. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.