My Retirement Savings Estimate how long your retirement savings may last using various monthly cash flow rates. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content 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? Acres of Diamonds In life it often happens that the answers to our most pressing questions are right in our own backyards. Coaches Coaches have helped you your whole life, in ways big and small. We'd like to be one of them.