down time
noun
mass noun
1- time during which a machine, especially a computer, is out of action or unavailable for use（尤指计算机等机器的）停止运转时间, 故障时间。
1.1
- figurative, chiefly N. Amer. time when someone is not working or active〈喻, 主北美〉（某人的）停工时间, 休息时间：
everyone needs down time to unwind.
人人都需要有时间停下来放松一下。