Linux

uptime
18:58  up 145 days,  4:57, 1 users, load averages: 6.19 4.70 5.30

It's off at the moment. I turn it off whenever I'm not using it for security reasons, and also just noise reasons so the fan doesn't bother me. It boots relatively quickly so I'm unbothered.

I've never had a Windows machine that can stay on longer than ~3 days before developing weird behaviour so it's off right now until I get home.

Uptime: 9 days, 13 hours, 36 mins

7 days currently, 30 days on the previous boot. I had to open it up to install extra drives.

I made Windows XP run for 40 days using a custom shell. Things got a bit weird, I ran defrag and memory optimization often.

My laptop has been up for 123 days. It gets put in standby when it's not in use. I should probably reboot into a new kernel soon.
My desktop gets shut down at night because it's power hungry.
My server gets shut down about once a year for cleaning and hardware upgrades.

My Arch system stays on until a firmware package needs an update. Then i cry and scream bc it's only been a month since the last one. Also I just updated a bunch of those, so my system has not been on long.

I think my desktop has been on the past couple days because I've been too lazy to turn it off because I caught the flu and basically slept the past couple days away.

I have all my devices set to reboot once weekly a few hours after daily scheduled updates. I probably don't need to do this, but I do. It's a habit I got in with scheduling router reboots, and then started extending it to other devices. It's nice to have some solid uptime, but I have three unbound DNS servers in sequence so they update and reboot on a staggered schedule so it's like they never go down.

You never know when the odd cosmic ray is gonna hit and flip yer bits.

07:38:25 up 15 days, 15:54, 2 users, load average: 2,93, 2,24, 1,65

Uptime: 26d 17h 44m

53 min

12 days and 17 hours. As another commenter pointed out, checked with uptime

It depends. Sometimes I shut it down every night. Occasionally, I'll leave it in sleep mode for a few days.

I think the longest uptime I've had on anything I've owned is probably a month or so on a Raspberry Pi 4 server I used to have running with a personal Mediawiki instance (I still have the Pi, but if I ran a server in my dorm, I have the feeling someone might come to bite off my hand).

I have an Nvidia GPU and suspend/resume works about 20% of the time so my PC is shutdown every time I won't use it for a few hours. Don't use my personal computer that much so it doesn't really bother me a lot. My laptop is however long the battery lasts with the lid closed, I don't use it much so most times I pick it up it's dead.

up 1 day, 8 hours, 2 minutes

23m,Short ik.

There was a period where I was testing my laptop's hibernation so I got uptime to around 30 days.

But now, The highest uptime I can reach is around 2-3 days if I forget to turn it off and leave it either plugged in or on a high battery so it lasts until the next day.

Mine turned off yesterday for an update.

I'm surprised how many people turn their computers off. My desktop uptime is 4 day, but, I do put it to sleep at night (which I think counts towards its uptime).

I will look into hibernating. The reason I don't shut down is because I usually end up with carefully placed windows and lots of ongoing projects all over. Restarting would mean I'd have to start all that up again - assuming I remember what I was doing.