When should you send thank-you notes after Christmas?

Within a week or two

There's no rule, but common practice is to write as soon as you can, ideally within a week or two of Christmas. A note is still worth sending after that. If you opened the gift in front of the giver and thanked them then, a note isn't needed, and if the giver wasn't there, a handwritten note is the preferred way to thank them.

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