It is possible to change the timeout in the configuration property com.unblu.session.pinTimeout.
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From the main menu in the Agent Desk select Settings then select the Advanced button.
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Ensure that the Key and Show Inherited check boxes are selected.
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Enter the search term tokenttl into the Filter field.
You can also use the technical label com.unblu.session.pinTimeout= to search for the value. 
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In the field enter the number of seconds before the PIN expires. The default is 120 seconds.
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Save then log out and back in to apply the changes.