3and threw him into the pit, and shut it and sealed it over him, so that he might not deceive the nations any longer, until the thousand years were ended. After that he must be released for a little while.
The term used here denotes completion, specifically in terms of a goal have been achieved. God detains Satan for this 1000-year period for a reason. Once that purpose is fulfilled, Satan can be released (briefly).
3 and threw him into the pit, and shut it and sealed it over him, so that he might not deceive the nations any longer, until the thousand years were ended. After that he must be released for a little while.