The interest-free period of some banks is 25-56 days, and the longest interest-free period is 56 days. The interest-free period of a credit card is 56 days, that is, the next bill is issued at sunrise, and then the repayment is postponed for 25 days, so the interest-free period can reach 56 days. If the bill is issued on the same day as the bill date, the repayment will be postponed for 25 days, and the shortest interest-free period will be 25 days.