EU citizens become eligible to apply for permanent residence after completing five years of continuous residence in the Czech Republic.

However, if you are a family member of an EU citizen (whether the EU citizen or a third-country national) who already holds permanent residence, you are only required to fulfill two years of continuous residence instead of the standard five years.

pros or advantages for foreigners with permanent residence:
Permanent residence status does not require regular renewals, reducing administrative burdens. Foreigners holding the permanent residence are often entitled to social benefits, including healthcare and education similar to the Czech citizens.