How to limit muliple dial-up connection duration

[morosband]

Hi

I would like to know if Linux help me limit or fix the dial-up internet duration of connection for multiple phone lines (5 or 6) attached to 1 PC server.
For instance , I want to install 6 internal 56K modems (attached to 6 phone lines) on my PC and configure them in such a way that the 1st line connects to the internet 3h/day and disconnects automatically then the 2nd line connects for another 3h/day and disconnects, and so on for the 4 remaining lines

Thanks

[adam7979]

try something like

0 0 * * * /usr/sbin/pppd -detach ttyS0 115200
0 3 * * * /kill/previous/pppd
0 3 * * * /usr/sbin/pppd -detach ttyS1 115200
0 6 * * * /kill/previous/pppd
0 6 * * * /usr/sbin/pppd -detach ttyS2 115200
0 9 * * * /kill/previous/pppd
0 9 * * * /usr/sbin/pppd -detach ttyS3 115200
0 12 * * * /kill/previous/pppd
0 12 * * * /usr/sbin/pppd -detach ttyS4 115200

in your /etc/crontab