My best uptime is Windows 2000, it runs for months and only goes down when there is a power outage.
.... and since they run connected to an UPS and there is a backup Power Generator serving the building, these machines were NOT ever switched off in case of power outage (only for actual hardware faults or intentionally for due maintenance/cleaning).
The point is the actual AMOUNT of uptime.
I have some NT 4.00 and 2K running 24/7 since 2002 or 2003 only switched off/rebooted a few times to replace disks and/or PSU's, that is some "uptime", ....
kids today, just kids having fun ...