Setting and extending Session-timeout

Hello! I'm a RADIUS newbie, so bear with me in case I ask stupid questions.... So here is a short description of what my project would needs to do: - every user can login via WIFI or LAN(public computer) - he can use wifi 24h/day - he can use public pc only 1h/day if he's authorized by default and he can extend the use if needed Logging is now working and users can log in, so one thing done:) Current problems: - how to not limit session-timeout for wifi and limit for public computers. All users have only 1 login name. I guess my best bet is some scripting with unlang?