Expiry date of test result

My wife got a certificate printed from her NHS app yesterday. Looking at it, it says under the QR code:

2D barcode expires:
11 December 2021 at 9.19 AM


Then right at the end it says:

Your 2D barcode expires 30 days from the date of issue. You can generate a new one by logging in to the NHS App, visiting the NHS COVID Pass section, then download or email yourself a new PDF copy.

So is it 2 days or 30 days. Why the difference?
 
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