offer duration of 发行有效时间
The duration of an offer shall not be less than 30 days and shall not be more than 60 days.
收购要约的期限不得少于三十日，并不得超过六十日。
Not all internships have a specific duration, so some interns stay on as long as possible in the hope of improving their chances of getting an offer.
并非所有实习职位都规定有明确的截止时间，以至于有些实习生会抱有“实习时间越长，转正机会越大”的想法。
Under the rules, the duration of an offer shall not be shorter than 30 days.
根据规定，收购要约约定的收购期限不得少于30日。
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