This is the relevant law.
Without prejudice to the application of special provisions, the residence permit may also be cancelled where the person concerned, without relevant reasons, is absent from the country:
(a) being the holder of a temporary residence permit, six consecutive months or eight interpolated months, in the total period of validity of the authorisation;
My common sense tells me that “in the total period of validity of the authorisation” refers to 2 or 3 years.
But I see that some people think it refers to 1 year, which makes sense considering Portugal’s economy and population drain. If it is 1 year, you can spend half of the year in Portugal for 5 years to qualify for the citizenship assuming you pass the language test, have local ties, etc.
Anyone here ACTUALLY knows which is true?