Because the loop also includes a stop at epcot the Answer is that the boats head to park that opens earliest 1 hr before it opens. If the park doesnt open untill 2 hours later than the boats will still make the resort loop and go to the park that opens the earliest by passing the one that opens later until 1 hour before that park opens. So if you are talking about HS at 7. Then starting at 6am the boats would go to Boardwalk, Yacht/Beach, Swan/Dolphin and repeat that loop until 8 am where they would then add in Epcot as a stop because it would be a hour before it opens at 9am. The answer is that the boats start one hour before park opens and normally end 1 hour after park close, the boat loop for the Epcot HS is different than the one for MK because of the two parks that may have different open and close times. As long as you dont have like a first thing in the morning breakfast at DHS and then are trying to make it to EPCOT right after then the boat loop shouldnt be a issue.