Some notes on the extra features I have added to autologout
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autologout you should know about already, but now it also, logs
a users total time, in a file /usr/etc/user_times, 
the #define START_DAILY is when the logging should comence, ie
I have it starting at 4pm. It is very basic and simply adds five
minutes each time it is run (assuming you run it every five minutes
from cron). It is smart enough to know when a user is logged on
passed midnight etc.  

rutime.c reads the user_times file and shows a list of the users
         the script showtimes then runs this program and sorts it
         into decending order, and prints some statistics for
         the day

log_line_use.c is meant to be run every five minutes from cron
         and it writes a text record to /usr/etc/line_use

showuse.c reads the /usr/etc/line_use file and displays a histogram
         of percentage utilisation, its a rough guide to how your
         lines are being utilised

proc_daily_times is a script that moves the current user_times file
         to a new file, 7 files (ie a week) are kept, I run this
         one at 23:59