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uptime

[uhp-tahym]
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noun
  1. the time during which a machine or piece of equipment, as a computer, is operating or can be operated.
  2. the time during which an employee is actually working.
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Compare downtime.

Origin of uptime

1955–60; up (in sense “operating”) + time
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for uptime

uptime

noun
  1. commerce time during which a machine, such as a computer, actually operates
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012