My Debian trixie desktop system rotates /var/log/apt/history once a month. So over the past year:
$ zgrep upgrade /var/log/apt/history.log*gz|wc -l
25
$ ls /var/log/apt/history.log*gz|wc -l
12
$
25 upgrades in 12 months. So about twice a month on average on that one.



















Note that at least on Debian, the
unattended-upgradespackage only, by default, does security updates. While those are the most important ones, if you want various bugfixes and such, you probably do want to at least occasionally do an update yourself.