I think, rough estimation, my server which is running Arch would last ~1 month with auto updating on
I honestly wouldn't recommend this for any server, and probably not for a workstation. This is useful for learning but could easily be a nightmare when troubleshooting an issue on a remote machine.
It's always a great idea to do updates when you can give them your attention. Even if it's you triggering them via ansible or other automation.
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