Well, certain stuff, like vandalism, isn't covered if vacant for more than a certain amount of days. It may be as few as 60 days. However, your policy may have a specific definition for "vacancy."

*Pro Tip* Words that are bolded in your insurance policy are listed in the Definitions page, and are specifically defined by your policy. All other words go by the definitions found in the dictionary and are defined in the most broad way to the benefit of the insured (you).