Documentation on the Timeout of the Dashboard

Add from the discussion on Google Group
https://groups.google.com/d/msg/munkireport/P0shMjjDosg/RunvKs0Qo-gJ

Thought adding this information into the repo sounded like a good idea. Not sure if adding this to the setup doc or maybe into a wiki page would be a better option. I'll leave that up to you to decide.

Thanks for supporting this project!!