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 Life and Death of a Twenty Dollar Bill How long does a $20 bill last? 4 Elements of an Estate Strategy Learn about the importance of having an estate strategy in this helpful and informative video. Retirement Is a Beginning Key questions to answer when you are considering retirement.