Extend Guest Access time limit, currently 1,4,8,24 hrs, need week, month, year options.

We would like to give Guest access to a host view only for longer than 24 hrs. We have a client that has a screen connect account and a PC host that monitors a water pump station. They would like to have clients in the city show the Water Pump software running on the host machine to clients and city officials. Free advertising for Screen Connect as well! Can this be done? I only see 1,4,8,24 hr access under host pass. I would like an indefinite option or at least a week or month or year.