Is Federal Police registration so close to expiration date a problem?

I'm here in Brazil with a residency visa and they give 90 days to register with the Federal Police, so that one can get their RNE, etc. I didn't register because I was waiting to find an apt to rent and I found it after 60 days, but then it was Xmas and NYE so I only made my PF appointment in early January, and their earliest appt was the morning of Jan 23rd. Since today is a state holiday in Rio I can't go into a bank to pay my GRU tax (a requirement to register with PF), so I have to wait til Monday (the 23rd), and thus no time to hit the bank beforehand.

I just found the only other spot for a few days later, but that only leaves me with 2-3 days before my 90 days is up. Is that going to be a problem and make it so I have to leave the country next week since I'm registering so close to the time limit? Or do you think my registration counts from the appt date?