tax question- had a vacancy in 2 different units in 2016

[Sam Y.]

hi, i've been a lil'landlord for over 10 years but never had two vacancies in two units in the same year.  i have 3 rental units in total. 

i'm starting my 2016 taxes and am stumped.  how do i answer: days rental was actually rented and days rental was offered for rent but not rented.  

one unit was vacant for 30 days but rent-able for 21 days, the other for 2 months- for repairs and improvements done on after my w2 job.  

am i supposed to add the total days that each individual units stayed vacant?  seems wrong....

thanks in advance.