ia.org/wiki/End_user">end users</a> see changes.
These updates can be expensive, for both the <a
href="https://en.wikipedia.org/wiki/Quality_assurance">quality
assurance</a> process and the overall cost of shipping and installing
updates to each device’s copy of <code><abbr>tzdb</abbr></code>.
Updates may be batched with other updates and may take substantial
time to reach end users after a release.
Older devices may no longer be supported and thus may never be updated,
which means they will continue to u