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? Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card. Building a Solid Financial Foundation Sustain financial well-being or create wealth through these actions.