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? Social Security: Five Facts You Need to Know Here are five facts about Social Security that are important to keep in mind. My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates.