When asking if a rental property "is rented every single day" of the year, do we count vacancy between tenants?

If the rental property was available for rent the whole year, with or without a tenant, then you would indicate "every single day".

Thanks!  That is what I thought. Zero vacancy is always the goal, but is often hard to attain.  I imagine that the objective of the question was to determine if the property was used for personal use.  

the objective of the question was to determine if the property was used for personal use.

That's what I looks like to me. What I've found in some experimentation a few years back, was that if you did not count vacancy between renters, it made no difference in any of the numbers as far as depreciation and allowed expenses go. However, if you have personal use days, that does make a difference and reduces the amount of depreciation you're allowed to take.