RD Licensing Manager changing expires on time

We have windows 2008 server with RD licensing manager.  We are basically out of licenses.  Before we buy more I wanted to make sure we didn't have old pc's not being used anymore taking a licenses.  Is there anyway to change the expires on date?  Some seem to be 2 years and others 1 year.  I wanted to change it to about 6 months, so I wouldn't waste a licenses on an old pc not being used.

I'm I looking at this right?  We have about 40 in temp and 1 license available.
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Dirk KotteSECommented:
"old" systems should consume a license for 90 days only.
you may revoke some RD-CALS (20%) for possible unused devices from Remote Desktop Licensing Manager.

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Windows Server 2008

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