UTM does not officially support such a time limit. Feature requests can be made/found at http://feature.astaro.com/ . UTM uses OpenVPN for the SSL VPN, so you may want to search Google for ways to implement this with OpenVPN. Client side changes would be done in the .ovpn config file on the client system. If it would require changes to the OpenVPN server (UTM) config, you would not want to do it if you are a paid licensee, as it would void your support and warranty.
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