Retiring the 4% Rule A portfolio created with your long-term objectives in mind is crucial as you pursue your dream retirement. Share | Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Contents 18 Years’ Worth of Days The average retirement lasts for 18 years, with many lasting even longer. Will you fill your post-retirement days with purpose? Certain Uncertainties in Retirement The uncertainties we face in retirement can erode our sense of confidence. A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals.