uptime

[ uhp-tahym ]
/ ˈʌpˌtaɪm /

noun

the time during which a machine or piece of equipment, as a computer, is operating or can be operated.
the time during which an employee is actually working.

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Origin of uptime

1955–60; up (in sense “operating”) + time
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for uptime

uptime
/ (ˈʌpˌtaɪm) /

noun

commerce time during which a machine, such as a computer, actually operates
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