How long does it take for the IRS to reply?

Call the National Taxpayer Advocate

https://www.taxpayeradvocate.irs.gov/contact-us/#FindlocalTAS

The IRS has been behind on correspondence for several years now.  The average wait on a response to a letter written to them is six months.  That's the average so half of them take longer than that.

 

If I were you I would wait until after April 15th to make contact with them.  Then you can contact your local IRS office directly and have someone check your case history and see if your letter has been processed yet.

 

Here's how to contact the IRS.

 

@BTRR 

Thanks for answering; much appreciated.

On 2/10, I faxed Form 911 to my local TAS.  On 2/15, they contacted me.  They requested a copy of my correspondence with the IRS.  They will assist "until it's resolved."

They are still finalizing returns from the prior year, so they are typically 8-12 weeks out. You can contact the IRS directly by phone here, so they can take a look. It may be a long hold since we are at the peak of the season. @BTRR