How long does it actually take to revive letter with 14 digit code

[SabrinaD2]

The IRS  doesn't appear to reference a particular time frame for sending the verification letter (Letter 5071C) with the 14-digit code.

If you haven't received it within 2-4 weeks, you can visit the IRS Identity and Tax Return Verification Service page. 

Additionally: You can go to Identity Verification Service and follow the online instructions