How soon do you get the physical green card after entry?

Retrogresser

Registered Users (C)
Hi All,

I entered the US via Newark after CP and had my Machine Readable Immigrant Visa (similar to I-551 stamp) endorsed. I was told that this was valid for 1 year and that I would get the physical green card in the mail soon.
It has been 18 days now. No welcome letter and no green card. I have not moved or anything like that.

When should I get worried and when should I expect to receive the card?
Thanks very much
 
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