My CentOS 6.5 Server has been up for over two years except for a couple of power failures which are not really relevant as it has a good sized UPS

I power down daily. No need to hibernate / suspend with the few seconds it takes to boot from SSD. I also run a rolling release, which means very frequent updates...

I buy that Linux is stable enough to make years of uptime possible. What about kernel security patches, though?

Only 35 days. Problems with power outage - very common in Brazil. My desktop reached ~90 days uptime once...

Less than a day.

The "14 users" just means lots of xterms.

My personal best was 450 days a while back, when a power outage lasted longer than myUPS.

So many great responses to this thread. I too reboot on major kernel upgrades as required, so rarely get past thirty days. My laptop dual boots into Win 10 for work stuff and Ubuntu 14.04 for the real stuff.

I have UPS, but it when the power goes down for more than five minutes, I do an orderly shutdown. Maybe once a year...

I have an eGPU, so I have to reboot each time I want to attach or detach it. So yeah, mine is not this big...

Oh, how foolish of me. Uptime, well, I do a hard boot every 3-4 days at least, just to clear my head. I answered "5 years", based on using Linux Mint for the last 3, then (the essential/same Ubuntu) for over 2 prior. "My bad!"

I shut down my desktop (floortop) every day before I go to work and reboot it when I get home. So about 12 hours a day. I run a bargain basement homebrew AMD machine with Sid, but with xfce it boots so quickly I have no reason to leave it running. The last desktop I had with a really long uptime (over a year) ate a cpu fan in the middle of the night and cooked itself (before onboard thermal monitors). As far as full system installs go It's been about two years on this box. It would be longer but doing a wipe and install is a fun thing to do on a saturday especially with a separate solid state root drive and a 6 (really 12) pack of beer.

I turn my pc off on weekends. Run around the clock during the work week.

We get power bumps, once a week or so. If I can keep it up a week, I'm happy.

Coded on linux for more than 20 years, now ...

... the last 20 of which were on a windows desktop secureCRTing/puttying in to a linux box.

I mean, cmon, windows EXCELs at winamp, putty and seamonkey.

If its any consolation, I don't reboot any of the winboxes lately either. :-P

You probably have dirty filters and a clogged powersupply fan.
That is, unless you are not counting downtime for maintenance.
Seriously, they put an off switch in both hardware and systems for a reason.