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uptime

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈʌpˌtaɪm/US:USA pronunciation: respellingUSA pronunciation: respelling(up′tīm′)

up•time (up′tīm′),USA pronunciation n.

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

up (in sense "operating'') + time 1955–60

Collins Concise English Dictionary © HarperCollins Publishers::

uptime /ˈʌpˌtaɪm/ n

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

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up time and down time OR uptime and downtime OR up and downtime
uptime

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uptime