Schedule E: Owner-Occupied Rentals, Percentage of Rental Use

I'm at a loss as to why Turbo Tax didn't calculate or help calculate this for me!

 

During the federal review, I have to determine the percentage of rental use for my vacation rental. Is  this referring to:

  • The square footage of the rental unit
    • 50% (both units are about equal in square footage)
  • The actual days rented
    • 23 days
  • The time it was not used personally during the seasonal rental period
    • 153 days

Any advice would be greatly appreciated!