For the December 30th sailing, we got our assignment on Dec. 17. It seems it's not done all at the same time because other GTY cabins were assigned a few days before us, starting on the 14th.
I think it tends to be within the last 2-3 weeks for a *GT booking. Regular-rate GTY rooms get assigned a little earlier. But as PP says, it can be anytime even right up until you check-in at the port.
we found out about 2 weeks in advance. DCL told us it would be 1 week, so we were surprised when we found out our room. We thought that we would not like it, but it was a great location. Just way different than our normal deck 2 experience.
*GT rooms tend to be assigned around 10-14 days out, usually on a Tuesday. But, as with all guarantee rooms, can happen at any time between original booking date all the up to, and including, embarkation day.
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