@vinceation Number of days of rented will be the number of days rented. Plain and simple.
Number of days of personal use will be ZERO. It's asking for the number of days of personal use of that 25% converted to a rental, *after* you converted it to a rental. So that will be ZERO. If you make it anything more than zero, that "will" affect the total of your rental expenses for that 25% that you are allowed to deduct, and it will also reduce the amount of depreciation you are allowed to take on that 25%.
Hopefully, that gets you on the right track now.
