In Hungary, permanent residence permits are issued for an indefinite period of time, but they need to be renewed periodically. The renewal process must be initiated at least 30 days before the expiration date of the current permit.

To renew your permanent residence permit in Hungary, you will need to submit an application to the Immigration and Asylum Office. The application must include the following documents:

• A completed application form
• A valid passport
• A proof of payment of the renewal fee
• A proof of your current address in Hungary
• A certificate of clean criminal record issued by the authorities of your country of origin or the country where you have lived for the last year
• A proof of health insurance coverage in Hungary
• A certificate of sufficient financial means to support yourself in Hungary

The exact requirements and documents may vary depending on your individual situation, and you may also be required to attend an interview with the immigration authorities.