The billing date of ICBC credit cards is calculated by natural month, that is, from 1 day to the last day of the month, the repayment date of ICBC is fixed, that is to say, you have n ICBC credit cards, and the repayment date of each card is 25th.

For example, you spent 500 yuan 65438+1 October 1, 300 yuan 65438+1October 3 1, 200 yuan1,and February 28th 1000.

Then you need to pay back 500+300 = 800 yuan on February 25th. February 1200 yuan, February 28th 1000 yuan, only need to pay off before March 25th 1200 yuan.

Therefore, if you spend 1 a month on ICBC's credit card, the interest-free repayment period is the longest, about 55 days to 56 days.