The three-day grace period of a credit card refers to three days after the repayment period. For example, if the repayment date is 33 days per month, then the grace period is 4 to 6 days per month. Cardholders should note that the deadline of grace period is not 23: 59 of all deadlines, and the grace period of some banks is 20 or 2 1 on the third day. Different banks have different terms.