accountable time; available time
Computing term referring to the time during which a system, service, or resource is available for use and can be accounted for.
We guarantee 99.9% server available time.
利用可能時間を超えると追加料金が発生します。
Additional charges apply when you exceed the accountable time.
稼働時間 refers to operating time or uptime, often for machinery or systems, while 利用可能時間 emphasizes the time available for use, often in billing or service contexts.
Compound of 利用 (use) + 可能 (possible) + 時間 (time), literally 'usable time'.