I received my paperwork for my Enhanced TN carry permit, so I mailed my completed paperwork and payment on June 1, 2022. I received the card in the US mail on June 28th with the card stating it had been issued June 21. So, about a month for the renewal process.
Now, this renewal changes the expiration month (permits expire 8 years from date of issue) so it's no longer my birth month. Do be aware if you decide to renew early that the expiration is 8 years from the issue date of the new permit, NOT 8 years extension from your old permit expiration date. You might want to time it more carefully than I did if you want to keep your expiration month the same as your birth month!
FWIW: TN driver's license are the same way - 8 years from date of issue!!
Not a huge deal, but it does make it harder to remember when it expires.... Get it on that calendar!!!!