I do not have a definitive answer for you but I have frequently arrived 1-1.5 hours before the official opening time and the left side booths have been open and I was able to get a great parking spot. Somebody else may be able to give you a more technical answer than mine. Be aware that the time may fluctuate because some mornings they open MK early...like 8am during peak seasons and 7am for am emh during peak seasons.