How to time-out OpenVPN clients after inactivity

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EFW 3.0:   I would like to time-out OpenVPN "road-warrior" clients after a period of inactivity. I also have many GW-to-GW tunnels so I want to be careful not to disrupt those. I found directives in OpenVPN docs   --inactive   and  --ping-exit   which looks like they should work for my clients, but I'm not sure how to implement them. It looks like I use the  ping-exit n in the client config.  Remove the  keepalive directive from /etc/openvpn/openvpn.conf.tmpl  and add   inactive n

Has anyone done this / got this to work? And once again, I don't want this to mess with the GW-to-GW tunnels.

Thanks