Outside the parks, there will be a Guest Relations and/or ticket booth (both can do pretty much the same things for guests) approximately thirty minutes before GUESTS are admitted. That includes for early breakfasts and Extra Magic Hours.
So...
On days when the regular opening time is 9:00AM, there will be a Guest Relations and/or ticket booth open outside that park as early as about 7:30AM.
On days when the Extra Magic Hours opening time is 8:00AM, there will be a Guest Relations and/or ticket booth open outside that park as early as about 7:30AM.
On days when the regular opening time is 8:00AM, there will be a Guest Relations and/or ticket booth open outside that park as early as about 6:30AM.
On days when the Extra Magic Hours opening time is 7:00AM, there will be a Guest Relations and/or ticket booth open outside that park as early as about 6:30AM.