peak time—
1. (also: peak hours) periods when traffic, consumption of electricity, etc. is at its highest:
- The survey shows that average peak time traffic speeds have risen.
2. (Radio, TV) a period characterized by the largest audience of the day:
- This peak-time program will be geared for a Sunday night family audience.
up time—the time when a machine or computer is operating:
- Maximum up-time is assured with the ability to replace a failed server disk or power supply, on-the-fly.
Note: The expression does not correlate in meaning with the phrase time is up—(of a period of time) expire; be over:
- The water clock was used to control speakers’ times. When the water ran out, the speaker’s time was up.
See also: high time / low time.