[Answer] What is the estimated lifespan of a U.S. $1 bill?

Step 1 : Introduction to the question "What is the estimated lifespan of a U.S. $1 bill?"

...The Federal Reserve Bank determines the quality of each bill, or note, that gets deposited into one of its branches. Sophisticated processing equipment evaluates each note as it comes through. The notes that are still in good condition and meet the strict quality criteria of the Federal Reserve go back into circulation. The Fed removes from circulation those that don't meet the required quality standard and destroys them. The larger denominations, such as the $100 bill, tend to stay in circulation longer because they aren't passed between users as frequently as the lower denomination bills. Source: FederalReserve.gov

Step 2 : Answer to the question "What is the estimated lifespan of a U.S. $1 bill?"

5.5 years:

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