Two days. Under normal circumstances, the credit card exhibition period of Agricultural Bank is two days, starting from the due repayment date and ending the next day. If the repayment is completed within the two-day repayment grace period, it will be regarded as normal repayment, which will neither generate penalty interest nor be registered as overdue behavior. However, it is best for the cardholder to return it as soon as possible before the next day, so as to avoid the repayment being unable to be returned due to the system's untimely liquidation.