一次延展的有效期是10年，时间从第一个股东开始签署延展协议时起算。

An extension is valid for 10 years from the date the first shareholder signs the extension agreement.

youdao

但是从本质上说，一旦他们开始了有效性测试，将需要6至48小时的时间。

But essentially once they begin that process, that integrity testing, could take anywhere between 6 to 48 hours.

youdao

但是从本质上说，一旦他们开始了有效性测试，将需要6至48小时的时间。

But essentially once they begin that process, that integrity testing, could take anywhere between 6 to 48 hours.

youdao