The period of stay of a "Permanent Resident(PR)" is indefinite, but it may be revoked.

The status of residence for foreigners staying in Japan has an expiration date, with the exception of some statuses of residence.
The status of residence of "Permanent Resident(PR)" has no restrictions on activities and no restrictions on the period of stay.
Therefore, the eligibility requirements are strict.
However, what you have to be careful about is that the person with the status of residence of "Permanent Resident(PR)" is a foreigner.
Therefore, as with other statuses of residence, the status of residence of "Permanent Resident(PR)" may be revoked if it falls under the grounds for revocation of status of residence or grounds for deportation.