uptime

uptime

The time during which a computer is operational. For some reason, the uptime counter on my PC hasn't been resetting when I shut it down, so it says it's been running for four days straight.
Farlex Dictionary of Idioms.

up time

n. the time when a computer is running. (Compare this with down time.) On some systems the down time is longer than the up time.
See also: time, up
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • up time
  • be shut of
  • be shut of (someone or something)
  • go counter
  • under the counter
  • shut
  • get shut of
  • get shut of (someone or something)
  • shut up
  • Shut up!