Drop VPN after 3 hrs

[cyberbot]

Hi Guys,
Some of our users at night forget to disconnect their VPN connection.
its cause a high job for the firewall.
I've read somewhere here that we can edit the (.ovpn) file to drop the connections after specified time.

I've found out to add the next to the .ovpn file reneg-sec 2880 to drop the connection after 8hr.
Can you guys advise if this the right way of doing things?
also we don't want to cash the password on the Windows computer. is there some kind of command to avoid this ?

Thank you