prime time

n. [from TV programming] Normal high-usage hours on a system or network.
Back in the days of big timesharing machines prime time was when lots of
people were competing for limited cycles, usually the day shift. Avoidance
of prime time was traditionally given as a major reason for night mode
hacking. The term fell into disuse during the early PC era, but has been
revived to refer to times of day or evening at which the Internet tends to
be heavily loaded, making Web access slow. The hackish tendency to
late-night hacking runs has changed not a bit.
