Daily on my Gentoo server, through a Cronjob every morning. It’s a custom script though, so there’s more than just doing an emerge update. It’ll send me ntfy notifications for the update results, if there are new news items, and if there are any time config merge updates to make. A few other things as well but that’s the main stuff.

Other servers, typically weekly or only manually when I ssh into them (for the ones I don’t really feel the need to update frequently).