> We currently operate on the basis of X number of hours per month and
> then excess hours at an extra fee, the sales people want to offer a
> discount service that is unlimited time per month BUT with a maximum
> time online for each session of 2 hours.
Its must be NAS support, but both the Ascend and Livingston
gear support the Ascend-Maxium-Time and Session-Timeout
attributes, respectively. The value is in seconds, also.