Four days.

According to information from the Credit Card Network, the "China Bank Card Self-Discipline Convention" requires banks to provide time tolerance services for cardholders, and the repayment grace period provided shall not be less than 3 days, while the Postal Savings Bank of China The grace period for bank credit cards is four days, and its repayment grace period ends at 5 p.m. on the fourth day after the due payment date.

Postal Savings Credit Card generally refers to the Postal Savings Bank of China credit card. Postal Savings Credit Card is a RMB credit card, a UnionPay standard card, and has all the functions and services of a UnionPay standard credit card.