I've been running a reasonably-sized farm of servers for almost a decade now. They were meticulously designed to meet the needs of my infrastructure and custom-secured to prevent intrusions. Given how long the boxes were up for I would have to say that they were pretty successful at their job.
 The longest uptime I had at 5.97 years!
 Slightly less at 4.35 years!
 I had to install some software about 2 years ago and hence the mere 1.8 years of uptime.
 The fourth server in my cabinet was reset with some regularity
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