.com.pt is unlimited.
However there is various restrictions for different subdomains
.pt is the Internet country code top-level domain (ccTLD) for Portugal and is managed by the Fundação para a Computação Científica Nacional (FCCN).
.com.pt: no restrictions; online registration
.edu.pt: education
.gov.pt: Government of Portugal
.int.pt: international organizations or diplomatic missions in Portugal
.net.pt: telecommunications providers
.nome.pt: individuals (nome is Portuguese for name)
.org.pt: Non-profit organizations
.publ.pt: publications (e.g. newspapers)
Since .PT enables you to protect your business online, a domain with .PT makes your web address unique and easy to memorize. A .PT extension is doing much more, helping you reach and communicate with the audience in Portugal.