I have been getting estimated arrival dates of 4th January on items from overseas.

And even items from Australia have estimated arrival dates of 20-23 December.

Some Chinese sellers ship their items in bulk to Hong Kong and Singapore where the post is faster and cheaper.  They often have to wait quite a while until there are enough parcels to kake it worth their while.

I have had long delivery estimates before but the items have always arrived long before the time is up.