Yes sheriff's dept response times can be terrible. But someone could have been there a lot sooner, and it does put pressure on the perpetrators. I would suggest trying to find out why you were targeted, if the establishment was cased beforehand, etc. These crimes are not usually random.
Good luck figuring that out.
Chances are, the thieves were monitoring the local dispatch over the radio (rural departments are not usually doing anything fancy) and knew exactly how long they had.