Way to use wtmp or "last" to gather total hours logged for a user?

I'm needing to figure out a way (util or command) to use the stats from wtmp or "last" output to basically show the total number of hours logged for a given user.  I've had a few people putting a great deal of over time, and want to use this as a rough gauge of hours.  I realize all the inaccuracies in doing this in terms of the fact that the individuals may not have acutally been working, etc.  I'm hoping that maybe there's an easy way to take the longest session for a user each day, to avoid totalling hours of multiple sessions/logins they may have had going, and or avoiding over-lapping sessions.

Any ideas?

derdleAsked:
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gheistCommented:
What problem are you solving?
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derdleAuthor Commented:
I'm trying to show a rough number of hours logged in for a user.  For people, including myself who do a lot of work at home, in addition to the office work-  I'd just like to gather a rough number of hours.  I know there are better ways and methods for this that we're implementing, now that we have a need.  ...but the need came about abruptly and I need to go back a few months and get an idea of the hours that have been logged into the system.
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gheistCommented:
http://www.freebsd.org/cgi/cvsweb.cgi/src/etc/periodic/monthly/200.accounting

this shell script shows user login summaries in FreeBSD system without asking.

put it in your crontab or so.

another is to look at www.redbooks.ibm.com for AIX accounting, and using
http://www.redbooks.ibm.com/abstracts/sg246396.html?Open
for CPU minute accounting etc.
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