VPN Time limit?

I’m new to these forums. I hope that I’m not to much of a novice for you all.

I have a back server off-site and run retrospect at the office to back-up users and the servers. I’d like to run my off-site server 24-7 on the VPN connection at home so I don’t have to run two copies of retrospect. Retrospect gets jammed up if you try to back up the same drive from to locations at the same time.

Running the off-site server 24-7 on the VPN would allow me to make the off-site server just another location for the local network retrospect to copy to. This would make things much easier to manage.

Finally the question. Right now my VPN connection times out somewhere around 24hours. How can I make the VPN server allow an indefinite connection. Both the office and the off-site are on cable modems.

Thank you!