Squid + Session Time Limit

I've done some googling on this, but haven't found a ton of info.
Before I head over to the squid list, just wondering if any PLUG'ers
have already done this.

I have a requirement to limit internet browsing time to a finite number
of hours. Currently, all browsing is going through Dansguardian, which
is going through Squid. I know how to limit browsing to certain
time-of-day using squid acls, but not how to limit a session to a number
of minutes/hours. I don't even know if this is possible in squid.

It doesn't seem to be a feature of Dansguardian and I would rather not
resort to some client-side widget bolted on the browsers. Squid seems
to be the best place to do this.

Anyone figured out a way to limit browsing sessions in this way?

...Kevin
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