The same requirements and time limits of the measure A51.
In what concerns historical data:
Since Law 32/2008 was declared unconstitutional, on 28th, April 2022, the courts are discussing the possibilities of requesting data retained for six months, when the investigations are about criminal offences punishable with imprisonment exceeding 3 years and a specific catalogue of crimes, such as drug trafficking, weapons detention and trafficking, smuggling, verbal abuse, threats, coercion and interference in a person's private life and disturbance of peace and tranquillity when committed by telephone, fake threats with the goal of causing general panic, ill-use of emergency lines, prison escape when the person was convicted for one of the above criminal offences.