Warren Kumari writes:
>
> This number comes from Evan.... :-)
>
> Less flippantly, it is in this email:
> https://www.ietf.org/mail-archive/web/dnsop/current/msg13004.html I
> don't think that we have a really good motivation for a week, other
> than that is feels sort of like a good, human scale timeframe to
> recheck on things. We really want there to be a limit on the lifetime,
> a week felt right... but, I still like "because Evan said so..."
>
> Are you OK with leaving it unmotivated[0], because there isn't really
> a good motivation?
>
RFC 1035 considers in Section 7.3 that a week for a TTL is excessive.
So you might use that as a (weak) guideline.
jaap
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