You are correct, I haven’t received anything yet from them. I submitted oct 1, so my 60 day mark is in December but I’m now concerned that they might not be counting my days at all since I haven’t received anything from them at all. All I know is that it was signed for.
This is all so frustrating! 
As long as it was signed for, you know they have your application, and the visa WILL be processed.
The only question is how long it will take. Not everyone receives the email from Sheffield - some emails do get missed accidentally - so that’s nothing really to be worried about. We have never seen Sheffield lose or not process an application.
Given that it seems to be taking about 3 weeks for Sheffield to acknowledge the application now (compared with 1-3 days before the new system), I would estimate that it could take at least 3 weeks longer than it was before... and it was taking up to 2 months then... so I would estimate about 3 months from your documents arriving in New York for the visa to be processed.
However, we don’t actually know how long it is taking because no one who has applied since mid-September has received decision yet.
You know they have the application, so all you can do now is wait.
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