I only reboot for kernel updates (and I'm not usually in a big hurry even then) and when I want to boot into Windows to play some Skyrim or do some development for Windows. I run Arch, so kernel updates come (relatively) fast and furious, but uptime says it's been 3 days, 2:25.

Do you use a staging server? You can try the updates there first.

I have several machines. I never reboot my Linux Server (unless I upgrade the kernel - less than once per year). I reboot my Linux DESKTOP after every use.

Only when requested by the OS after a major software update.

By the way, I turn off my computer after finishing working on it. Turning on and, later, turning off my computer is not a issue for me due to the fact that each one is a very quick operation.

Cheers.

personal laptop, I restart probably once a week, or whenever I install a new update/upgrade that requires a restart, I started treating my work/personal linux machine as if it is a production machine, rarely restarts and no updates/upgrades unless you actually need it

Centos6. 231 days and counting. Love never seeing "to finish installing your Windows updates you must reboot your machine".

Only when upgrading my slackware, so powercuts are the most common, at about 2x per year. Even the laptop doesn't get turned off, just put to sleep. Uptime on my laptop is currently 4-5 months IIRC. I only upgrate when i absolutely have to.

not easy to answer this because we may have multiple machines.
home: off unless used.
work: reboot only for issues.
laptop: duh

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I either hibernate or do a shutdown every night, just so I'm not wasting energy. Other than that, I can't recall the last time I "had to reboot" my linux system.

Couple reasons

Updates that require it (which I do not do often enough)
And Power outages longer than UPS can handle.

Think my longest uptime was 6 months or so.

i have 2 acer revos that have a 50 watt power adapter. (my flood lites outside take 75 watt bulbs and i leave those on all nite).

My main Linux desktop reboots only for kernel updates, long power outages, and other rare events. Uptime tends to be in weeks or months. (To be fair, the WinXP legacy system I'm trying to retire has been running for over 2 months, by some miracle, probably because it doesn't access the Internet anymore and does almost nothing.)

I reboot my desktop each and every morning.

Since i have only been using LInux (MINT17-MATE) for less than a month 4weeks as a dual boot in my mid tower multi use build and just 2 weeks as a replacement for Vista sp3 in an old Toshiba Satellite 215 laptop. It , linux, has revitalized this 'old' laptop. it now speeds through all daily basic internet, email and fast look up/searchs tasks. It is certainly as fast for these minor tasks as the AMD FX8350/990FXA and 7950 gpu.
I am impressed and trying to learn as fast as i can how to keep this laptop useful again. I reboot this laptop because there is nothing more to do. but, i am still experimenting with linux to see what shortcomings i might need to address, in terms of missing software or apps so leave it in a suspend mode for a day or 2. I am finding that just whatever came with the initial installation was adequate to get me through the first week. no crashes, no hanging up or spinning pin wheels as was all that happened in vista for the past 2yrs which is why the laptop was relegated to a dust collector on a shelf. no longer , use it daily and for a couple of hours sometimes , so far
still have plenty to learn, though. i know so little, i am just beginnning to realize how much more there is to look into. will be trying to totally eliminate the vista portion and vista OS, just save a couple of picture, document and mp3 folders. only a 160gig hard drive in this thing and now split with ext4 and windows . will be trying to figure out how to best re partition and eliminate all of windows but the few mbs of files i want to save. i may be looking into a ssd, but , so far, this is fast enough to keep me happy for a bit

I thought this was asking about desktops and not laptops? I hate to be picky but, as I recall, there was a laptop thread and they are very different machines!
Anyhow, complaining over, I switch on my desktop when I want to use it and switch it off again when I stop -- meaning it runs for a few hours every weekday and, sometimes, all weekend. The effort to enable hibernation on Debian just doesn't seem worth it when you consider it doesn't speed up boot much and suspend would leave my machine in the hands of an unreliable electricity supplier. To leave a desktop PC switched on all the time would draw a little more electricity than I would like to pay for.
Going back to my original point -- I've a Raspberry that was running for a week or so and it's conceivable it'll run for ages -- if I use it as my "desktop" does it count?
Apologies for snarkiness.

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