The only moment I turn off my pc is when I go away for more then 2 days or when I have some new hardware I need to build in.
Second usually also the time I also take a vacuum cleaner through my machine.
Reboots take place maybe once every 2 months when I get enough of windows or my antivirus whining it needs to after installing (Driver) update #3452345.
A well built computer on which you do not install too much garbage can easily last a good while without having to shut down or reboot.
Then again I don't buy 'A-Brand' computers with the exception of laptops but have always had and will have self built computers.
I should be around 1100 to 1200 days of playtime myself, started playing in August 2004.
Will post screenshot when I get home.