The link below gives the approximate minute that the sun will disappear below the horizon from Maui, Hawaii. However, as the seasons change, the sun's position along the horizon also changes. This means that other islands such as Lanai may be in the path of the sunset and therefore the sun will go down earlier. Also, it is not uncommon to have beautiful cloud formations along the horizon which will also make the sunset times earlier. It has been our experience that a ceremony starting two hours before the listed times will be able to adjust to any outdoor conditions and still take advantage of the spectacular sunsets that the island of Maui has.
Here's a great sunrise/sunset calculator you can use to determine the best time to schedule your ceremony.