Crystal Palace early am. How early can I show for 9am ressie?

[luvdisney77]

Tried my best to get an early morning ressie at CP for my daughter's 6th birthday, but could only find 9:10am. How early can I check-in for that reservation. I know it is a 9:10 reservation, but that could be very counter productive if I can't check-in until or sit down to eat at 9. THANKS!!