what I've been hearing is Disney says transportation starts an hour before the parks open, but I've heard from people who have been recently that they are starting earlier. I know in October when we took an Uber, we had to wait until 9:15 to get into DHS parking lot along with the rest of the people driving. I have heard they are letting guests in as early as an hour to 45 minutes before park opening. I'm guessing it all depends on the lines for transportation and the lines to get into the park. The longer the line, I think, the earlier they start.