noun
available time
Technical computing term referring to the time a system, resource, or service is available for use.
サーバーの可用時間は99.9%を達成している。
The server's available time has reached 99.9%.
Compound of 可用 (kayō, 'available') and 時間 (jikan, 'time'), likely a calque from English 'available time' used in computing contexts.