It usually takes between 6-12 days for a car to be shipped from Hawaii to the mainland United States. This time frame can vary depending on factors, such as weather conditions and vessel availability. When booking your reservation, it's important to provide accurate information about the drop-off party, license plate number, and vehicle title to ensure a smooth registration process. Additionally, fully operational brakes and emergency brakes, as well as fully inflated tires, are a must to safely deliver your vehicle to its destination.