the longest interest-free period of Ping An Bank's credit card is 51 days: for example, on the 2th billing date, the repayment date of 11/2 bills is 12/8, so the earliest consumption in 11/2 bills may occur on 1/2, and this consumption can enjoy the interest-free period of 51 days;

The shortest interest-free period of Ping An Bank is 18 days. For example, on the 2th billing date, the repayment date of 1/2 bill is 11/8, so the last consumption in 1/2 bill may occur on 1/19, and this consumption can only enjoy the interest-free period of 18 days.