How long has your PC been on for?
How long has your PC been on for?
I have been going strong for 34 days and 5 hours.
You can check by running inxi in the command line or checking the CPU in Mission Center
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34 days without booting? Are you using a Debian system and don't update often? You should, for security patches at least. I'm on an Arch based system and update every day. Sometimes there are updates that require a reboot, so all services are up to date. My system is often up for a few days, sometimes even for a week.
Small tip, logging out and in will have a semi clean environment without a full boot. That means the uptime won't reset.
I have 4000 packages to update
That's a lot. But that also means your system is not very secure, as you are missing ton of security patches for the packages.