From Nintendo's FAQs:
<snip>
Do Surveys Expire?
Answer:
Yes. Product Registration surveys for physical games registered via PIN expire after 7 days. Product Registration surveys for digital games, when offered, expire after 30 days. Post-play surveys expire after 120 days.
</snip>
So I guess it's confirmed that all physical games are only 7 days and all downloadable games are 30. We should update the survey expiry section of the OP because it still says 7 days for both.
<snip>
Do Surveys Expire?
Answer:
Yes. Product Registration surveys for physical games registered via PIN expire after 7 days. Product Registration surveys for digital games, when offered, expire after 30 days. Post-play surveys expire after 120 days.
</snip>
So I guess it's confirmed that all physical games are only 7 days and all downloadable games are 30. We should update the survey expiry section of the OP because it still says 7 days for both.