There is no time limit for the sale of pre-qualified bidding documents, which varies from project to project. When to open the bid shall be subject to when the tender documents are sold, and the bid shall not be opened until 20 days after the date of sale of the tender documents. The shortest time from issuing the tender documents to bid opening shall not be less than 20 days. According to the characteristics of the project demand and the current market supply situation, bidders with similar qualifications, value objectives and attention to the project can be selected from known potential bidders to participate in the bidding competition, which is conducive to balanced competition among bidders and to achieve the bidding demand objectives through scientific bid evaluation standards and methods. The workload and cost of bidding are relatively small, which can not only save the procedures and time of bidding announcement and pre-qualification, but also obtain basic or better competitiveness.

However, compared with public bidding, the number of bidders is relatively small and the degree of competition openness is relatively weak. If the tenderer knows the limitations of the bidder's information before selecting the bidding object, it may lose its due competitive effect, and it will not be able to obtain the most suitable bidder and obtain the best competitive benefit.

Legal basis: Article 24 of the Bidding Law of People's Republic of China (PRC).

The tenderer shall determine the reasonable time required for the bidder to prepare the bid documents; However, the project that must be subject to tender according to law shall not be less than 20 days from the date when the tender documents are issued to the deadline when the bidders submit their tender documents.