I try and get to all ports between 10:30 and 11. Im VIP (or whatever the new name is) and there is no point in getting there after boarding starts, so I make sure Im there in time to check in before boarding starts.
Boarding can start any time from 10:30 to after Noon, depending on the previous cruise.
Im on Miracle myself, assume you are too? and that's my plan. I plan to be there before 11 am.
If you are not VIP then you will board in zones. I dont know of any ports that dont hand out zone cards according to when you check in.
Conquest 7/21/13, Miracle ALASKA 8/27/13, Miracle HAWAII 9/17/13, Celebrity Summit, 11/30/13, Celebrity Summit, 12/7/13, Celebrity Constellation, 2/7/14, NCL Epic 3/2/14, Allure 5/4/14, Allure 11/2/14, Quantum 12/8/14