Uptime is the length of time a system has been running
continuously. If your server has not been rebooted in a month, you
would have an uptime of about 30 days.
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There is no upper limit for uptime on Windows. I believe the
current record is somewhere around five years.
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Uptime Software is a fairly large company in computing terms.
They do not have large numbers of employees but they do have a
large customer base in over 40 countries using their products.