18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Share | Related Content Tuning Your Social Security Benefit When should you take your Social Security benefit? What's So Great About a Rollover? Making a career move requires tough decisions, not the least of which is what to do with the funds in your retirement plan. Retirement Plan Distributions There are a number of ways to withdraw money from a qualified retirement plan.