period of stay; authorized length of stay; duration of stay
Refers to the legally permitted period a foreign national may remain in a country, commonly used in immigration and visa contexts.
Please apply for renewal before your period of stay expires.
The authorized length of stay for this visa is 90 days.
在留資格 refers to the status of residence (e.g., student, worker), while 在留期間 refers to the length of time one is allowed to stay.
滞在期間 is a more general term for duration of stay, not necessarily tied to legal permission; 在留期間 is specifically the authorized period under immigration law.
extension of visa permit
Compound of 在留 (ざいりゅう, 'staying in a foreign country') and 期間 (きかん, 'period').