Can I scan the health code after a long time?

Yes, I can. Health codes can be scanned after a long time. By default, health codes are valid for 7 days. The health code has expired, and you need to declare your health again to get it again. When the health code expires due to expiration, just click "Update Now" on the QR code.

First open Alipay, click the health code, then select the region, click the View Now button, click the View My Health Information button, and finally click the View Punch Record button at the bottom. Because the health code will be updated with the change, so don't worry, it can be scanned after a long time. Because the health code needs to be constantly updated.