~$7,800
less in interest on average household credit-card debt
The average U.S. household carries $10,563 in credit-card debt at about 22% APR. On a fixed payment near the minimum, that costs roughly $15,400 in interest over about 20 years. Adding an extra $125/month clears it in about 6 years 7 months for roughly $7,600 in interest, around $7,800 less paid to the bank.
Illustrative, based on a fixed monthly payment at current average APR; actual payoff depends on your card's minimum-payment formula and rate.