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Uptime is a measure of the time a computer system has been up and running. It came into use to describe the opposite of downtime, times when a system was non-operational.

It is often used a measure of computer operating system reliability and stability, in that this time represents the time a computer can be left unattended without crashinging, or needing to be rebooted for administrative or maintenance purposes.

Netcraft maintains the uptime records for many thousands of web-hosting computers.

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