Retirement Plan Distributions The slideshow presentation that you would like to view is too large for your current screen resolution. Click here to view to view the slideshow at full resolution. Launch Presentation » Share | Related Content 18 Years Worth of Days The average retirement lasts for 18 years. Are you prepared to fill that many days? Social Security Benefits: How Much Will I Receive Calculating your potential Social Security benefit is a three-step process. Potential Income from an IRA Estimate your monthly and annual income from various IRA types.