Boa tarde,
Before, citizenship could occur six years after receiving residency. Then it became five years.
Now, citizenship can occur five years after applying, due to recognizing SEF was behind for a few years on processing. Welcome news!
This change is not yet signed into law, but has passed. See a lawyer’s description [English] for more information: https://www.linkedin.com/pulse/portuguese-nationality-5-year-period-now-starts-from-date-reis-f3kff
tl;dr – study faster, O CIPLE is relevant more quickly for some of us!