Is it a WIBU or Codemeter network key?
I'm not sure about Codemeter but with the WIBU key there is a way to 'time out' the license if it has not been used for a certain period.
I believe the default is set to 24 hours but I can't remember if this feature is activated by default or not.
Also I can not remember if you have to set this just on the server machine or the individual users machine as well.
Open the WIBU key settings dialogue and refer to the attached image.
This will not shut down Archicad for the user but it will give them a message to say the license can no longer be found and it should free up the license for others.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11