The activation time for opening a credit card is limited. It needs to be activated within the validity period of the card. It cannot be activated after the validity period. Generally speaking, the validity period of a credit card is 3-5 years.

The expiration date of a credit card is usually marked on the bottom of the front of the card. For example, if there is a "08/24" mark on your credit card, it means that your card will expire in August 2024.