200 days in Hawaii County (Big Island) to be eligible for residency. If you had your legal domicile in Hawaii for the whole tax year, or if you lived in Hawaii for at least 200 days (no matter where you had your domicile in this period), you are a resident of Hawaii. There are some exceptions, however: military employees and students are not considered residents if their domicile is outside Hawaii and if they resided in Hawaii for more than 200 days solely for educational or work purposes.
>> Detailed Hawaii Residency Requirements