Can I transfer my Non-O Marriage visa to my new passport at Suvarnabhumi Airport?

Let me get this straight, you are taking the word of US Embassy officials against Thai Immigration? Good luck

I sent my passport to the embassy on Oct 4 and I got it back on Nov 7

I renewed my US passport from the US Embassy in Bangkok with normal time processing and took approximately 3 and a half weeks. It arrived in the mail.

I have a Swiss passport which I renewed in Switzerland. The visa pages in the old passport were not "holed". I entered TH with both passports. Back in TH I went to immigration to transfer the visa. Easy.

And this is why you DO NOT listen to embassy people about anything to do with thai immigration stamps. 🙁

You cannot transfer your extension OR re-entry permit at Suvarnabhumi when you fly out.

You can show BOTH passports when you fly out, they'll stamp you out on the new one, and when you come back you show both again and they'd stamp you in

BUT

What they won't do is transfer your existing extension or re-entry permit (which will be in the old passport) to the new one.

The way that is actually supposed to work is you get the new passport, you take BOTH passports to the immigration office that issued the extension, they'll transfer the existing extension, re-entry permit (if you got that permit at their office) to the new passport along with the relevant other stamps and THEN you show the new passport when you exit the country.

Now as far as how long does it take to get a US passport, post on the US expat in thailand group and ask as that is about as far from a thai visa question as you can throw a stick.

I'd say you should bank on it taking as long as it says on the ACS (American Citizen Services division) of the US Embassy website under "renew a passport in thailand". Plan on at least that, know that there are US holidays comin' up that means passport process will be extended (as nothing moves during US holidays)