According to Judy's Facebook profile anyway. And as she has had her Christmas tree up in her study for almost a week now, she should know! 63 days will just be about enough time if you have toys or other items that need to be assembled.
Ever notice they put the age a toy is suitable for on the outside of the packaging, but never the IQ required to assemble it? It took three of us an hour tonight to assemble an item deemed suitable for a three year old.
And, while we're on the matter, 63 days should be just about long enough (at one bin collection a fortnight) to dispose of all the useless packaging you'll gather up as well.