I don't really understand why my DNI expires in March when I didn't get it until June... but at least I know the rules now and know that I must renew at migraciones within 60 days or pay a 50% tariff when renewing it as expired.
Your DNI expires the same day your temporary residency expires. It doesn't matter when you actually
receive your DNI.
Technically, you aren't renewing your DNI, You are renewing your temporary residency.
I received my precaria in October of 2006. I didn't get my DNI until January of 2007. The renewal date was the same day that I was officially granted the precaria.
Back in those days (the dark ages) it was necessary to go to the Registro (a horrible place) in person just to ask for a turno and occasionally the turnos were suspended for weeks or months at a time. I went to the Registro the same day I received my precaria. They weren't giveing advance turnos, but they said they could take my DNI application at that time.
Unfortunately, all I had was the precaris. In those days it was also necessary to provide additional documentation (copies of passport and/or the birth certificate with the apostille. Fortunately, I had extra copies of my birth certificate and my (translated) passport at my apartment. I raced back to Palermo and then returned to the Registro to get the ball rolling.
I was told to return in 90 days (exactly) to pick up my DNI. I did just that, but that took about three hours.
My first two renewals also required return trips to thye Registro. No turno was required.but it was necessary to arrive an hour before they started "working" (further delayed as the employees drink mate.)..
My first two renewals and the cambio de categoria to permanent residency on the third renewal were all done at migraciones without advance turnos, but it was necessary to arrive early to get a numbe.
At least for the cambio de categoria I didn't have to return to the Registro to have the change noted in my DNI (the old style). They had a tent outside migraciones in Retiro for that. But it took an extra ten days and a lot of time because Migraciones "lost" my file the day before I went to get the certificado of permanent residency (which was in the file).
Even though I was not responsible for the loss of the file I had to pay for a new certificate as if I lost the original and return ten days later to receive a new one. I then was able to make a turno to get the cambio noted in my DNI.
When I returned to the tent a week later for the cambio,, the person who stamped my DNI never asked to see the certificado. He could see the change to permanent residency in his computer.
Some thing are much better (and easier) than they used to be.