I would like to make you aware of the fact that there is no way to restore a borrowed license in your license server if the borrowed client machine has crashed
For the most part of the Autodesk products, the maximum borrow period is 180 days (6 months).
We can see the maximum borrow period for each feature, in the license file, under the value BORROW=4320, where 4320 is the time in hours. In this case, 180 days correspond to 4320 hours. Please, don’t try to change this value in the license file, it would make the license file invalid.
It is important that you use the borrow feature in a way, that the borrow period reflects the period you really need to use your license disconnected from the server.
As best practice in an environment where people are supposed to borrow the licenses frequently, it is advised to set a maximum borrow period reflecting the needs of the user.
This would allow the license administrator to control the borrow period.
To set a borrow period lower than the default one set in the license file, you need to set in the option file the statement MAX_BORROW_HOURS.
Please don’t use the Borrowing tab in the LMTOOLS utility, it doesn’t work with the Autodesk products. Autodesk products licenses must be borrowed from the product interface.
The sample line bellow, set the maximum borrows period to AutoCAD 2011 to 3 days: MAX_BORROW_HOURS 85536ACD_2011_0F 72
Please refer to the technical solution How to control network license access using an options file, to set your options file.