Ending User Processes via Cron

I am using a IBM AIX 4.2 and have a minor nuisance that I would like to eliminate. Each day, I have users that incorrectly close a telnet application that they use to reach the AIX machine and as a result that user is still active on the server. Iwant to use cron to query the active users at a particular time of day and kill all processes for those users that have not been active for more than two hours.