The absolute earliest you should book out of San Juan is noon, the more time you can give yourself the better. The difference between San Juan and other ports like Miami is there is no self disembark option so yes, it can take longer to start getting people off the ship in San Juan.

For example I sailed out of Miami the week before sailing out of San Juan, with both ships having the same arrival time. In Miami they started disembarking the ship at 6:30 am, I was in the 4th color to be called after self disembark and I was off the ship at 7:15. In San Juan they didn't even start calling any colors at all until around 8:30. Early flights in Miami were those before 10am. Out of San Juan anything before 11 was considered early and if your flight was before noon you couldn't use the AA Onboard Check In that RCCL has.

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