根据国家有关文件，对部分商品实施“三包”在时间上有如下规定：1．“7日”规定。即产品自售出之日起7日内发生性能故障，可以选择退货、换货或修理。2．“15日”规定。即产品自售出之日起15日内发生性能故障，消费者可以选择换货或修理。3、‘’三包有效期”规定。三包有效期 According to relevant national documents, the implementation of the “three guarantees” for certain commodities has the following provisions in time: 1. “7th” regulation. That is, the product has a performance failure within 7 days from the date of sale and can be returned, replaced or repaired. 2. “15th” regulations. That is, the product malfunctions within 15 days from the date of sale, and consumers can choose to exchange or repair. 3. The ‘‘Three Guarantees Validity Period’’ provision.