期限 (qī xiàn): time limit

The deadline for this assignment is next Friday; you'd better finish it two days early.

The library stipulates that the loan period for books is two weeks, and if you don't return them by the deadline, you'll be fined.

The deadline for applying for the visa was approaching, so he hurriedly sent out the materials.

The doctor said this medicine must be taken within its expiration period; once expired, it can no longer be used.

The company requires employees to reimburse travel expenses within the specified time limit; otherwise, the finance department will not process them.