Had a Dell Dimension running Win98 and it went for 12 years - powered up for most of the time although it would go into sleep/hibernate when not required so did have a large number of on/off cycles. It just became too slow and changes meant I no longer needed it for hosting printers and ISDN fax.
LaserJet5P from '95 which is still going strong ...
An 8 year old Dell Latitude laptop that is used occasionally and a Toshiba Laptop coming up 10 years ...
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taurus excreta cerebrum vincit