Namely, a cached checkout as considered as “expired” after 9 months.  In
my case, it gives this:

--8<---------------cut here---------------start------------->8---
scheme@(guix git)> (cached-checkout-expiration "/home/ludo/.cache/guix/checkouts/pjmkglp4t7znuugeurpurzikxq3tnlaywmisyr27shj7apsnalwq/")

;;; (ttl 1701596081)

;;; (maxttl 1651827028)
$6 = 1651827028
--8<---------------cut here---------------end--------------->8---

Of course having to re-clone entire repositories every 9 months is
ridiculous, but storing gigabytes of packs is worse IMO (I’m
specifically thinking about the Guix repo, which every users copies via
‘guix pull’).

Thoughts?

Thanks,
Ludo’.