At the naturalization ceremony about three weeks ago, they told us that our resident ID cards would no longer be valid in one month. They told us to go get our DNIs right away. So, I started the process.
The folks at the RENIEC, the ones who process the DNI (documento nacional de identidad), told me it would take about two months and I could expect to have it on October 1, 2018, about one month after my resident ID card expired. None of my family and friends thought it would take so long.
The family and friends were correct: on August 20, 2018 I picked up my DNI. It took less than three weeks! Well done, RENIEC! How about that wanted-dead-or-alive face in the picture?!?!
Next steps: get a passport and change the documents associated with my bank accounts.