We were able to add a day onto all three rooms that we have booked and they even gave us the free dining on the extra day even though it was past the deadline for booking. I think that as long as it's available at the resort that you're staying at, it won't be a problem.
I added a day earlier to the arrival time and 1 day extra to our departure date 19 days before we leave and had no problems or fees and we were able to get the free dining extended too!
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