maintenance downtime

基本解释

What accounts for the frequent "emergency" maintenance downtime?
是什么决定经常性的紧急维护时间？
It is a common problem to reduce the downtime associated with a site; however, scheduled maintenance downtime is a necessary evil.
缩短站点的停机时间是一个常见问题；不过，计划的维护停机时间却是一件必要的“坏事”。
On the other hand, deploying a new revision of the application will be more involved and may need to be performed as a part of scheduled maintenance downtime.
而另一方面，部署应用程序的新修订涉及的方面更多，可能需要在计划维护停止期间执行。

The other 144 is utterly essential to keep lights on when unexpected demand arises from heat waves, outages or maintenance downtime.
FORBES: Brownout
Refineries are running out of headroom to expand existing capacity (refineries routinely run at 95% of capacity now, increasing maintenance requirements and thus downtime) while NIMBY-ism blocks new refineries from being built.
FORBES: Magazine Article