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? Jane Bond: Infiltrating the Market Agent Jane Bond is on the case, cracking the code on bonds. What Smart Investors Know Savvy investors take the time to separate emotion from fact.