The permitted period of stay in a country or region under an immigration/residence status (usually specified on a visa or residence card).
彼の在留期間は来年の3月に満了します。
His period of stay expires in March next year.
ビザの在留期間を延長するために申請書を提出した。
I submitted an application to extend the visa's period of stay.
入国審査で係員に在留期間と在留カードを確認された。
At immigration control, the officer checked my period of stay and residence card.