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? Systematic Withdrawals in Retirement Taking regular, periodic withdrawals during retirement can be quite problematic. A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals.