You are correct that Toontown typically opens one hour later than the rest of the MK (10am on days that the park opens at 9). As far as EE, I have seen it open at both 9 and 10am. I believe it depends on the time of year. In late August 2002 (no longer considered peak/summer season) we did EE from 8 to 9 and then went over to Toontown expecting it to be open but it remained closed until 10am. I would expect during busier times of the year that Toontown may open at 9 during EE (when MK opens at 8 for resort guests).