[bloak]

The example in the article seems to expire after 48 hours:

4: 1624458597, # QR code expiry 6: 1624285797} # QR code generated

1624458597 - 1624285797 = 172800 = 48 * 60 * 60

(I would have thought they could afford to be a bit more generous than that. If they were valid for a few weeks then it would be practicable to print them out.)

[pfg]

To add a real datapoint: the QR expiry date for the certificate of my second shot is set to 360 days after I received the shot.

[supermatt]

The example is fictional.