I have mineral interest in wells that were permitted in Nov 2014 but there has not been and apparently will not be any drilling on the site. How long is a permit good for?
I know it is at least a year and possibly longer. Still very early in the game as to your permit - I have seen many months pass with some operators between permit and rig on location
My own experience is that drilling either follows permits pretty quickly or not at all. However, with this downturn, who knows... Good luck!