Yes there is a setting to control when vgp updates the policy. It is called PolicyRefreshRate and it goes in the /etc/opt/quest/vgp/vgp.conf file.
You can run the following command to set the Policy Refresh rate to 100 minutes:
Below is an example of modifying the policy refresh rate to 100 minutes.
/opt/quest/bin/vgptool config daemon PolicyRefreshRate 100
The default for this setting is 90 minutes. If the setting is not specified then it will update every 90 min.